.travis.yml in appbundler-0.6.0 vs .travis.yml in appbundler-0.7.0

@@ -1,12 +1,16 @@
-rvm:
-  - 2.0.0
-  - 2.1.1
-  - 2.2
-
-branches:
-  only:
-    - master
-
-# The integration tests need to see installed gems.
-script: rspec --color --format progress
-
+before_install:
+  - gem update --system
+  - gem install bundler
+
+rvm:
+  - 2.0.0
+  - 2.1.1
+  - 2.2
+
+branches:
+  only:
+    - master
+
+# The integration tests need to see installed gems.
+script: rspec --color --format progress
+