.travis.yml in fake_ftp-0.1.1 vs .travis.yml in fake_ftp-0.2.0

@@ -1,5 +1,8 @@
 language: ruby
+sudo: false
+dist: trusty
+cache: bundler
 rvm:
-  - 2.0.0
-  - 1.9.3
-  - 1.8.7
+- 2.4.1
+- 2.3.4
+- 2.2.7