Remove patch Ruby versions from Travis build matrix

sds · sds · commit 7b3f45e1611b · 2019-10-10T22:05:30.000-07:00
These are no longer necessary to specify.
diff --git a/.travis.yml b/.travis.yml
@@ -9,9 +9,9 @@ env:
     - "JRUBY_OPTS=--dev"
 
 rvm:
-  - 2.4.6
-  - 2.5.5
-  - 2.6.3
+  - 2.4
+  - 2.5
+  - 2.6
   - jruby-9.2.6.0
 
 before_install:
