Drop Ruby 2.1 support

https://www.ruby-lang.org/en/news/2017/04/01/support-of-ruby-2-1-has-ended/
tricknotes · Apr 14, 2017 · 22d5481 · 22d5481
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commit 22d5481
Showing 1 changed file with 0 additions and 1 deletion.
diff --git a/.travis.yml b/.travis.yml
@@ -3,7 +3,6 @@ cache: bundler
 sudo: false
 
 rvm:
-  - 2.1.10
   - 2.2.7
   - 2.3.4
   - 2.4.1