Remove old ruby versions from travis tests

Author: ondrejbartas

.travis.yml

@@ -5,8 +5,6 @@ rvm:
   - 2.4
   - 2.3
   - 2.2
-  - jruby-19mode
-  - rbx-19mode
 services:
   - redis-server
 branches:
@@ -18,7 +16,3 @@ notifications:
       - ondrej@bartas.cz
 env:
   travis: 'yes'
-matrix:
-  allow_failures:
-    - rvm: jruby-19mode
-    - rvm: rbx-19mode