.travis.yml in ledger_sync-1.0.2 vs .travis.yml in ledger_sync-1.0.3

@@ -2,6 +2,8 @@
 sudo: false
 language: ruby
 cache: bundler
 rvm:
   - 2.5.1
-before_install: gem install bundler -v 2.0.1
+before_install:
+  - gem update --system
+  - gem install bundler