removing 1.9.3 from travis

metasploit_data_models requires Ruby version >= 2.1.

Author: darkbushido

.travis.yml

@@ -25,7 +25,6 @@ script:
   - git diff --exit-code && bundle exec rake $RAKE_TASKS
 sudo: false
 rvm:
-  - '1.9.3'
   - '2.1'
 
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