Rails 6 (#785)
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Enable Rails 6 migrations
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Update Ruby versions and remove rbx
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Remove support for Devise 4.0 to 4.5. Minimum supported Devise version is 4.6
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Update Gemfile to use latest versions when possible. Add newer Ruby versions to travis config
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Use latest bundler 2.0.1
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Drop Rails 4.2 support
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Up required rubygems version to 2.5.0
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Update minimum required versions for Ruby, Devise, Bundler, Actionmailer
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Update devise version in gemspec
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Standardize devise version (4.6) across all Gemfiles