ci: Changes to CI configuration and supported versions

ci: Changes to CI configuration and supported versions

Author: Mikemosca

.travis.yml

@@ -6,7 +6,7 @@ sudo: required
 rvm:
 - 2.5.1
 - 2.6.1
-- 2.7.1
+# - 2.7.1
 
 before_install:
   - git fetch --tags

README.md

@@ -398,8 +398,8 @@ If you have issues with the APIs or have a question about the Watson services, s
 
 Tested on:
 
-* MRI Ruby (RVM): 2.3.7, 2.4.4, 2.5.1
-* RubyInstaller (Windows x64): 2.3.3, 2.4.4, 2.5.1
+* MRI Ruby (RVM): 2.5.1, 2.6.1
+* RubyInstaller (Windows x64): 2.5.1, 2.6.1
 
 ## Contributing