Use bundler to install bundler?

Author: kpaulisse

script/travis-before-install

@@ -4,4 +4,4 @@ set -e
 DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && cd .. && pwd )"
 cd "$DIR"
 DESIRED_BUNDLER_VERSION=$(grep "add_development_dependency 'bundler'" octocatalog-diff.gemspec  | cut -d"'" -f4)
-gem install bundler -v "$DESIRED_BUNDLER_VERSION"
+bundle install bundler -v "$DESIRED_BUNDLER_VERSION"