Require tests against rails 6.0, run tests against rails 6.1.alpha

Rails 6.0 requires ruby >= 2.5, so ruby 2.4 is not tested by default
and replaced with 2.6

gemfiles/rails_42.gemfile

@@ -2,8 +2,8 @@
 
 source "https://rubygems.org"
 
-gem "actionpack", "~> 4.2"
-gem "railties", "~> 4.2"
+gem "actionpack", "~> 4.2.0"
+gem "railties", "~> 4.2.0"
 
 group :development do
   gem "appraisal", "~> 2.2"

gemfiles/rails_50.gemfile

@@ -2,8 +2,8 @@
 
 source "https://rubygems.org"
 
-gem "actionpack", "~> 5.0"
-gem "railties", "~> 5.0"
+gem "actionpack", "~> 5.0.0"
+gem "railties", "~> 5.0.0"
 
 group :development do
   gem "appraisal", "~> 2.2"

gemfiles/rails_51.gemfile

@@ -2,8 +2,8 @@
 
 source "https://rubygems.org"
 
-gem "actionpack", "~> 5.1"
-gem "railties", "~> 5.1"
+gem "actionpack", "~> 5.1.0"
+gem "railties", "~> 5.1.0"
 
 group :development do
   gem "appraisal", "~> 2.2"

gemfiles/rails_52.gemfile

@@ -2,8 +2,8 @@
 
 source "https://rubygems.org"
 
-gem "actionpack", "~> 5.2.0.beta2"
-gem "railties", "~> 5.2.0.beta2"
+gem "actionpack", "~> 5.2.0"
+gem "railties", "~> 5.2.0"
 
 group :development do
   gem "appraisal", "~> 2.2"

gemfiles/rails_60.gemfile

@@ -2,10 +2,8 @@
 
 source "https://rubygems.org"
 
-git "https://github.com/rails/rails.git" do
-  gem "actionpack", "~> 6.0.0.alpha"
-  gem "railties", "~> 6.0.0.alpha"
-end
+gem "actionpack", "~> 6.0.0"
+gem "railties", "~> 6.0.0"
 
 group :development do
   gem "appraisal", "~> 2.2"

gemfiles/rails_61.gemfile

@@ -0,0 +1,23 @@
+# This file was generated by Appraisal
+
+source "https://rubygems.org"
+
+git "https://github.com/rails/rails.git" do
+  gem "actionpack", "~> 6.1.0.alpha"
+  gem "railties", "~> 6.1.0.alpha"
+end
+
+group :development do
+  gem "appraisal", "~> 2.2"
+  gem "pry", "~> 0.10.1"
+  gem "pry-byebug", "~> 3.2.0"
+  gem "sdoc", "~> 0.4.1"
+  gem "telegram-bot-types", "~> 0.6.0"
+  gem "rspec", "~> 3.5.0"
+  gem "rspec-its", "~> 1.1.0"
+  gem "rspec-rails", "~> 3.5.0"
+  gem "rubocop", "~> 0.52.1"
+  gem "coveralls", "~> 0.8.2", require: false
+end
+
+gemspec path: "../"