.travis.yml in json-streamer-2.0.1 vs .travis.yml in json-streamer-2.1.0

@@ -1,5 +1,9 @@
 sudo: false
 language: ruby
+addons:
+  apt:
+    packages:
+    - libyajl2
 rvm:
   - 2.3.3
 before_install: gem install bundler -v 1.14.6