Remove bundler before installing new one

Author: kpaulisse

.travis.yml

@@ -5,6 +5,7 @@ install: true
 script: "script/cibuild"
 
 before_install:
+  - gem uninstall bundler
   - gem install bundler -v 1.15.4
 
 matrix:

script/bootstrap

@@ -11,12 +11,6 @@ shopt -s extglob
 cd "${DIR}/bin" && rm -f !(octocatalog-diff)
 set +e
 
-# Under travis CI install our bundler version
-if [ -n "$TRAVIS_JOB_ID" ]; then
-  cd "$DIR"
-  gem install vendor/cache/bundler-*.gem
-fi
-
 echo 'Running bundler'
 cd "${DIR}" && \
   rm -f Gemfile.lock && \