Upgrade to rails 6

Author: YuKitAs

Gemfile

@@ -5,31 +5,31 @@ git_source(:github) do |repo_name|
   "https://github.com/#{repo_name}.git"
 end
 
-gem("bcrypt", "~> 3.1.7")
-gem("jwt", "~> 2.1.0")
-gem("puma", "~> 5.6.7")
-gem("rails", "~> 5.2.3")
-gem("rubocop")
-gem("sqlite3")
+gem('bcrypt', '~> 3.1.7')
+gem('jwt', '~> 2.1.0')
+gem('puma', '~> 6.3', '>= 6.3.1')
+gem('rails', "~> 6.0")
+gem('rubocop', '~> 1.56')
+gem('sqlite3')
 
 group :development, :test do
-  gem("byebug", platforms: [:mri, :mingw, :x64_mingw])
-  gem("rspec-rails")
-  gem("simple_command", "~> 0.1.0")
+  gem('byebug', platforms: [:mri, :mingw, :x64_mingw])
+  gem('rspec-rails', '~> 6.0', '>= 6.0.3')
+  gem('simple_command', "~> 0.1.0")
 end
 
 group :development do
-  gem("listen", "~> 3.2.0")
-  gem("spring")
-  gem("spring-watcher-listen", "~> 2.0.0")
-  gem("web-console", "~> 3.7.0")
+  gem('listen', '~> 3.2.0')
+  gem('spring')
+  gem('spring-watcher-listen', '~> 2.0.0')
+  gem('web-console', '~> 4.2')
 end
 
 group :test do
-  gem("database_cleaner")
-  gem("rspec")
-  gem("rspec-mocks")
-  gem("shoulda-matchers", "~> 4.4.0")
+  gem('database_cleaner', '~> 2.0', '>= 2.0.2')
+  gem('rspec')
+  gem('rspec-mocks')
+  gem('shoulda-matchers', '~> 5.3')
 end
 
-gem("tzinfo-data", platforms: [:mingw, :mswin, :x64_mingw, :jruby])
+gem('tzinfo-data', platforms: [:mingw, :mswin, :x64_mingw, :jruby])