Disable JRuby tests for now

They're really slow, and we don't *really* need these until 1.0.

Author: mcmire

.travis.yml

@@ -8,4 +8,4 @@ rvm:
   - ruby-2.6.3
   - ruby-2.5.5
   - ruby-2.4.6
-  - jruby-9.2.7.0
+  #- jruby-9.2.7.0

README.md

@@ -174,8 +174,7 @@ Finally, submit your PR and I'll take a look at it when I get a chance.
 
 ## Compatibility
 
-`super_diff` is [tested][travis] to work with RSpec 3.x, Ruby >= 2.4.x, and
-JRuby >= 9.2.x.
+`super_diff` is [tested][travis] to work with Ruby >= 2.4.x and RSpec 3.x.
 
 [travis]: http://travis-ci.org/mcmire/super_diff