Bump haml from 4.0.7 to 5.1.0

[dependabot-preview]

Bumps haml from 4.0.7 to 5.1.0.

Changelog

Sourced from haml's changelog.

5.1.0

Released on May 16, 2019
(diff).

• Rails 6 support #1008 (thanks Seb Jacobs)
• Add escape_filter_interpolations option for backwards compatibility with haml 4 defaults #984 (thanks Will Jordan)
• Fix error on empty :javascript and :css filter blocks #986 (thanks Will Jordan)
• Respect changes in Haml::Options.defaults in Haml::TempleEngine options (Takashi Kokubun)
• Un-freeze TempleEngine precompiled string literals #983 (thanks Will Jordan)
• Various performance/memory improvements #965, #966, #963 (thanks Dillon Welch)
• Enable frozen_string_literal magic comment for all .rb files #967 (thanks Dillon Welch)

5.0.4

Released on October 13, 2017
(diff).

• Fix haml -c --stdin regression in 5.0.2. #958 (thanks Timo Göllner)
• Ruby 2.5 support (it wasn't working due to Ripper API change). (Akira Matsuda)

5.0.3

Released on September 7, 2017
(diff).

• Use String#dump instead of String#inspect to generate string literal. (Takashi Kokubun)
• Fix Erubi superclass mismatch error. #952 (thanks Robin Daugherty)

5.0.2

Released on August 1, 2017
(diff).

• Let haml -c fail if generated Ruby code is syntax error. #880 (Takashi Kokubun)
• Fix NoMethodError bug caused with Sprockets 3 and :sass filter. #930 (thanks Gonzalez Maximiliano)
• Fix list_of helper with multi-line content. #933 (thanks Benoit Larroque)
• Optimize rendering performance by changing timing to fix textareas. #941 (Takashi Kokubun)
• Fix TypeError with empty :ruby filter. #942 (Takashi Kokubun)
• Fix inconsistent attribute sort order. (Takashi Kokubun)

5.0.1

Released on May 3, 2017
(diff).

• Fix parsing attributes including string interpolation. #917 #921
• Stop distributing test files in gem package and allow installing on Windows.
• Use ActionView's Erubi/Erubis handler for erb filter only on ActionView. #914

... (truncated)

Commits

• 3595825 Version 5.1.0
• 8d340f2 Unused variable
• cfb3285 Empty line after magic comment
• 7501189 Stop CIing ruby 2.6 x rails 5.0
• bf3d153 CI against newer rubies
• 2fa5eab ⚠️ Use assert_nil if expecting nil from test/options_test.rb:16. This ...
• 055573d Action View 6 warns without this
• dc12704 Another requirement for Action View 6 Base
• a8fc7d4 Seems like this method needs to be defined to act like Action View 6 Base
• 31f03d6 Action View 6 Base#initialize requires an instance of LookupContext
• Additional commits viewable in compare view

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[dependabot-preview]

Superseded by #60.