.travis.yml in opentok-2.4.1 vs .travis.yml in opentok-2.5.0

- old
+ new

@@ -4,13 +4,13 @@
 # Travis bug, see https://github.com/bundler/bundler/pull/3559
 cache: bundler
 before_install: gem update bundler
 rvm:
 - 1.9.3
-- 2.0.0
-- 2.1.0
-- 2.2.0
-- 2.3.0
-- 2.4.0
+- 2.0
+- 2.1
+- 2.2
+- 2.3
+- 2.4
 notifications:
   slack:
     secure: agVll2R9PTPvJMcUgbvOh9eGt60zGDc8kPUwEsiQr828rCgXh/ZxD5irYDyKQg3ZsS8+f3MjFCwzU7uQALkia2pDrie9d8g8m1dt4Q5U7Qm6QecshvE0U9JwbB5Ngxaftbqyf0XEFrE7CKs7RI1BzFRpe8m+fdZgfwccX8Gb7pc=