Drop Ruby 2.1.x support

- Since support for it [ended on 2017-04-01](https://www.ruby-lang.org/en/news/2017/04/01/support-of-ruby-2-1-has-ended/)
gonzedge · Dec 19, 2017 · edec450 · edec450
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diff --git a/.travis.yml b/.travis.yml
@@ -28,12 +28,3 @@ rvm:
   - 2.2.2
   - 2.2.1
   - 2.2.0
-  - 2.1.8
-  - 2.1.7
-  - 2.1.6
-  - 2.1.5
-  - 2.1.4
-  - 2.1.3
-  - 2.1.2
-  - 2.1.1
-  - 2.1.0
diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -2,6 +2,7 @@
 
 ## 1.0.2 [compare][compare_v1_0_1_and_master]
 
+- Drop Ruby 2.1.x support by [@gonzedge][github_user_gonzedge]
 - Add Ruby 2.4.{2,3}, 2.3.{5,6} 2.2.{8,9} to supported versions by [@gonzedge][github_user_gonzedge]
 - Add Ruby 2.3.4 and 2.2.7 to supported versions by [@gonzedge][github_user_gonzedge]
 

diff --git a/README.md b/README.md
@@ -232,10 +232,10 @@ The Rambling Trie has been tested with the following Ruby versions:
 * 2.4.x
 * 2.3.x
 * 2.2.x
-* 2.1.x
 
 **No longer supported**:
 
+* 2.1.x (might still work, but is not officially supported)
 * 2.0.x (might still work, but is not officially supported)
 * 1.9.x
 * 1.8.x