Upgrade to rails 6#39

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Shehbaz wants to merge 9 commits intolocalytics:masterfrom

patterninc:upgrade-to-rails6

Commits on Sep 1, 2020

Change gemspecs and gemfile
Shehbaz
committed

Commits on Sep 2, 2020

Upgrade to rails5.2.1
Shehbaz
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Commits on Sep 29, 2020

Commits on Oct 8, 2020

Change params for Column class initializer
Shehbaz
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Commits on Oct 16, 2020

Support json type field
Shehbaz
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Commits on Oct 29, 2020