.travis.yml in bundler-fixture-1.4.0 vs .travis.yml in bundler-fixture-1.5.0

@@ -26,6 +26,10 @@
     - rvm: 2.1.10
       env: BUNDLER_TEST_VERSION=1.14.6
     - rvm: 2.2.7
       env: BUNDLER_TEST_VERSION=1.14.6
     - rvm: 2.3.4
-      env: BUNDLER_TEST_VERSION=1.15.0.pre.4
+      env: BUNDLER_TEST_VERSION=1.15.0
+    - rvm: 2.1.10
+      env: BUNDLER_TEST_VERSION=1.15.0
+    - rvm: 2.2.7
+      env: BUNDLER_TEST_VERSION=1.15.0