.travis.yml in mini_mime-0.1.3 vs .travis.yml in mini_mime-0.1.4

@@ -8,11 +8,12 @@
   - 1.8.7
   - 1.9.2
   - 1.9.3
   - 2.0.0
   - 2.1.10
-  - 2.2.6
-  - 2.3.3
+  - 2.2.7
+  - 2.3.4
+  - 2.4.1
   - ruby-head
   - jruby
   - jruby-9.0.5.0
   - jruby-9.1.6.0
   - jruby-head