Drop support for rails 4.2.x

No longer supported by rails so no longer supported by me. I will support 5.0 and 5.1 for a bit because it is easy as of now.

.travis.yml

@@ -17,4 +17,3 @@ env:
   - RAILS_VERSION=5.2.3 SQLITE3_VERSION=1.3.11
   - RAILS_VERSION=5.1.4 SQLITE3_VERSION=1.3.11
   - RAILS_VERSION=5.0.0 SQLITE3_VERSION=1.3.11
-  - RAILS_VERSION=4.2.5 SQLITE3_VERSION=1.3.11

docs/active_record/README.md

@@ -4,7 +4,6 @@ An ActiveRecord adapter for [Flipper](https://github.com/jnunemaker/flipper).
 
 Supported Active Record versions:
 
-* 4.2.x
 * 5.0.x
 * 6.0.x
 

flipper-active_record.gemspec

@@ -25,5 +25,5 @@ Gem::Specification.new do |gem|
   gem.metadata      = Flipper::METADATA
 
   gem.add_dependency 'flipper', "~> #{Flipper::VERSION}"
-  gem.add_dependency 'activerecord', '>= 4.2', '< 7'
+  gem.add_dependency 'activerecord', '>= 5.0', '< 7'
 end

flipper-active_support_cache_store.gemspec

@@ -21,5 +21,5 @@ Gem::Specification.new do |gem|
   gem.metadata      = Flipper::METADATA
 
   gem.add_dependency 'flipper', "~> #{Flipper::VERSION}"
-  gem.add_dependency 'activesupport', '>= 4.2', '< 7'
+  gem.add_dependency 'activesupport', '>= 5.0', '< 7'
 end

script/test

@@ -12,11 +12,6 @@ cd $(dirname "$0")/..
     exit 0
 }
 
-export RAILS_VERSION=4.2.5
-export SQLITE3_VERSION=1.3.11
-script/bootstrap || bundle update
-bundle exec rake
-
 export RAILS_VERSION=5.0.0
 export SQLITE3_VERSION=1.3.11
 script/bootstrap || bundle update