drop support for ruby 2.0

kivikakk · kivikakk · commit 2f2a13bdfb3b · 2018-01-30T13:00:16.000+11:00
nokogiri 1.8 requires &gt;= 2.1.0
diff --git a/.travis.yml b/.travis.yml
@@ -2,7 +2,6 @@ dist: trusty
 sudo: required
 language: ruby
 rvm:
-  - 2.0.0
   - 2.1.10
   - 2.2.7
   - 2.3.4
