Update sinatra requirement from ~> 1.4, >= 1.4.6 to >= 1.4.6, < 5.0

[dependabot[bot]]

Updates the requirements on sinatra to permit the latest version.

Changelog

Sourced from sinatra's changelog.

1.4.8 / 2017-01-30

• Fix the deprecation warning from Ruby about Fixnum. #1235 by Akira Matsuda

1.4.7 / 2016-01-24

• Add Ashley Williams, Trevor Bramble, and Kashyap Kondamudi to team Sinatra.

• Correctly handle encoded colons in routes. (Jeremy Evans)

• Rename CHANGES to CHANGELOG.md and update Rakefile. #1043 (Eliza Sorensen)

• Improve documentation. #941, #1069, #1075, #1025, #1052 (Many great folks)

• Introduce Sinatra::Ext to workaround Rack 1.6 bug to fix Ruby 1.8.7 support. #1080 (Zachary Scott)

• Add CONTRIBUTING guide. #987 (Katrina Owen)

1.4.6 / 2015-03-23

• Improve tests and documentation. (Darío Hereñú, Seiichi Yonezawa, kyoendo, John Voloski, Ferenc-, Renaud Martinet, Christian Haase, marocchino, huoxito, Damir Svrtan, Amaury Medeiros, Jeremy Evans, Kashyap, shenqihui, Ausmarton Fernandes, kami, Vipul A M, Lei Wu, 7stud, Taylor Shuler, namusyaka, burningTyger, Cornelius Bock, detomastah, hakeda, John Hope, Ruben Gonzalez, Andrey Deryabin, attilaolah, Anton Davydov, Nikita Penzin, Dyego Costa)

• Remove duplicate require of sinatra/base. (Alexey Muranov)

• Escape HTML in 404 error page. (Andy Brody)

• Refactor to method call in Stream#close and #callback. (Damir Svrtan)

• Depend on latest version of Slim. (Damir Svrtan)

• Fix compatibility with Tilt version 2. (Yegor Timoschenko)

• Fix compatibility issue with Rack pretty method from ShowExceptions. (Kashyap)

• Show date in local time in exception messages. (tayler1)

• Fix logo on error pages when using Ruby 1.8. (Jeremy Evans)

• Upgrade test suite to Minitest version 5 and fix Ruby 2.2 compatibility. (Vipul A M)

... (truncated)

Commits

• 1f4444d Bump stable to 1.4.8
• 0f64edc Merge pull request #1235 from sinatra/fix-stable
• c013394 Break this up into 2 statements so jruby doesn't get pegged
• dcc25ce I must have been tired
• 78d732b This is too hard
• 9638de8 Pick versions of nokogiri, activesupport, and i18n that work everywhere
• 3944e1a Pick a version of json which works everywhere
• c4f0133 Pick a version of liquid which works everywhere
• 5dc6d6d Pin rake to a version that works everywhere
• 8642818 Update build for supported Ruby versions and remove HEAD testing of tilt/rack
• Additional commits viewable in compare view

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