Drop Ruby 2.1 from CI

sds · sds · commit 6ca4ed823b9b · 2018-03-31T19:39:07.000-07:00
Support for 2.1 ended in April 2017: https://www.ruby-lang.org/en/news/2017/04/01/support-of-ruby-2-1-has-ended/
diff --git a/.travis.yml b/.travis.yml
@@ -5,7 +5,6 @@ sudo: false
 cache: bundler
 
 rvm:
-  - 2.1
   - 2.2
   - 2.3.7
   - 2.4.4
diff --git a/README.md b/README.md
@@ -55,7 +55,7 @@ any Ruby code.
 
 This project aims to support the following Ruby runtimes on both \*nix and Windows:
 
-* MRI 2.x
+* MRI 2.2+
 
 ### Dependencies
 
diff --git a/appveyor.yml b/appveyor.yml
@@ -4,8 +4,6 @@ clone_depth: 1
 
 environment:
   matrix:
-    - RUBY_FOLDER_VERSION: "21"
-    - RUBY_FOLDER_VERSION: "21-x64"
     - RUBY_FOLDER_VERSION: "22"
     - RUBY_FOLDER_VERSION: "22-x64"
     - RUBY_FOLDER_VERSION: "23"

-Original file line number
+Diff line change
 cache: bundler
 rvm:
 -  - 2.1
   - 2.2
   - 2.3.7
   - 2.4.4