Update bundler requirement from ~> 1.14 to ~> 2.0

[dependabot-preview]

Updates the requirements on bundler to permit the latest version.

Release notes

Sourced from bundler's releases.

v2.0.2

Changes:

• Fixes for Bundler integration with ruby-src (#6941, #6973, #6977, #6315, #7061)
• Use __dir__ instead of __FILE__ when generating a gem with bundle gem (#6503)
• Use https on externals links in the Bundler gemspec (#6721)
• Removed duplicate gem names from the suggested did you mean list for gem typos (#6739)
• Removed Ruby 1.x compatibility code (#6764, #6806)
• Fixed an issue where bundle remove would crash with certain Gemfiles (#6768)
• Fixed indentation in the Bundler executable template (#6773)
• Fixed an issue where plugins could register for the same Bundler hook multiple times (#6775)
• Changed the "multiple sources" message in bundle install to be a warning instead of an error (#6790)
• Fixed a bug where path gems would break when using only_update_to_newer_versions (#6774)
• Fixed a bug where installing plugins with the --delpoyment setting would fail (#6805)
• Fixed an issue where bundle update couldn't update & install a gem when no_install was set (a bundle package config) (#7078)
• Fixed an issue where users could not run bundle exec on default gems (#6963)
• Updated vendor libraries to their latest version (#7076, #7068)
• Fixed an issue where the github source was not using https by default that we mentioned in the 2.0 release (#7182)
• Fixed an issue where rake release was not outputting the message to users asking for a 2fa token (#7199)

Documentation:

• Fix incorrect documented BUNDLE_PATH_RELATIVE_TO_CWD env var (#6751)
• Update URLs in Bundler's documentation to use https (#6935)

Changelog

Sourced from bundler's changelog.

2.0.2 (2019-06-13)

Changes:

• Fixes for Bundler integration with ruby-src (#6941, #6973, #6977, #6315, #7061)
• Use __dir__ instead of __FILE__ when generating a gem with bundle gem (#6503)
• Use https on externals links in the Bundler gemspec (#6721)
• Removed duplicate gem names from the suggested did you mean list for gem typos (#6739)
• Removed Ruby 1.x compatibility code (#6764, #6806)
• Fixed an issue where bundle remove would crash with certain Gemfiles (#6768)
• Fixed indentation in the Bundler executable template (#6773)
• Fixed an issue where plugins could register for the same Bundler hook multiple times (#6775)
• Changed the "multiple sources" message in bundle install to be a warning instead of an error (#6790)
• Fixed a bug where path gems would break when using only_update_to_newer_versions (#6774)
• Fixed a bug where installing plugins with the --deployment setting would fail (#6805)
• Fixed an issue where bundle update couldn't update & install a gem when no_install was set (a bundle package config) (#7078)
• Fixed an issue where users could not run bundle exec on default gems (#6963)
• Updated vendor libraries to their latest version (#7076, #7068)
• Fixed an issue where the github source was not using https by default that we mentioned in the 2.0 release (#7182)
• Fixed an issue where rake release was not outputting the message to users asking for a 2fa token (#7199)

Documentation:

• Fix incorrect documented BUNDLE_PATH_RELATIVE_TO_CWD env var (#6751)
• Update URLs in Bundler's documentation to use https (#6935)

2.0.1 (2019-01-04)

Changes:

• Relaxed RubyGems requirement to >= 2.5.0 (#6867)

2.0.0 (2019-01-03)

No new changes

2.0.0.pre.3 (2018-12-30)

Breaking Changes:

• Bundler 2 now requires RubyGems 3.0.0 at minimum

Changes:

• Ruby 2.6 compatibility fixes (@​segiddins)
• Import changes from Bundler 1.17.3 release

Note: To upgrade your Gemfile to Bundler 2 you will need to run bundle update --bundler

2.0.0.pre.2 (2018-11-27)

... (truncated)

Commits

• 496bca5 fix changelog 2.0.2 typos
• 111d04e add v2.0.2 changelog
• 8b7b84f bump version to 2.0.2
• 6705960 Merge #7199
• 293d743 Merge #6798 into 2-0-stable (#7182)
• 50c3395 fix bug where bundler v3 is running a test for bundflet 2
• 1953cfd Merge #6798
• f54469e Merge pull request #7109 from bundler/colby/port-gem-helper
• da0ff0c add bors configuation
• e8ea176 port GemHelper from master
• Additional commits viewable in compare view

Dependabot will resolve any conflicts with this PR as long as you don't alter it yourself. You can also trigger a rebase manually by commenting @dependabot rebase.

---

Dependabot commands and options

You can trigger Dependabot actions by commenting on this PR:

• @dependabot rebase will rebase this PR
• @dependabot recreate will recreate this PR, overwriting any edits that have been made to it
• @dependabot merge will merge this PR after your CI passes on it
• @dependabot squash and merge will squash and merge this PR after your CI passes on it
• @dependabot cancel merge will cancel a previously requested merge and block automerging
• @dependabot reopen will reopen this PR if it is closed
• @dependabot ignore this [patch|minor|major] version will close this PR and stop Dependabot creating any more for this minor/major version (unless you reopen the PR or upgrade to it yourself)
• @dependabot ignore this dependency will close this PR and stop Dependabot creating any more for this dependency (unless you reopen the PR or upgrade to it yourself)
• @dependabot use these labels will set the current labels as the default for future PRs for this repo and language
• @dependabot use these reviewers will set the current reviewers as the default for future PRs for this repo and language
• @dependabot use these assignees will set the current assignees as the default for future PRs for this repo and language
• @dependabot use this milestone will set the current milestone as the default for future PRs for this repo and language
• @dependabot badge me will comment on this PR with code to add a "Dependabot enabled" badge to your readme

Additionally, you can set the following in your Dependabot dashboard:

• Update frequency (including time of day and day of week)
• Pull request limits (per update run and/or open at any time)
• Out-of-range updates (receive only lockfile updates, if desired)
• Security updates (receive only security updates, if desired)

Finally, you can contact us by mentioning @dependabot.

[dependabot-preview]

Superseded by #22.