.travis.yml in thinreports-0.10.1 vs .travis.yml in thinreports-0.10.2

- old
+ new

@@ -1,17 +1,16 @@
 language: ruby
 sudo: false
 rvm:
   - 2.1.10
-  - 2.2.7
-  - 2.3.4
-  - 2.4.1
-  - jruby-9.1.8.0
+  - 2.2.9
+  - 2.3.6
+  - 2.4.3
+  - 2.5.0
+  - jruby-9.1.15.0
 
-branches:
-  only:
-    - master
-    - /stable$/
+before_install:
+  - travis_retry gem update --system
 
 notifications:
   slack:
     secure: XubYKuE3+6VJNDvjgVE2P0cp3Km/We1RlhkeHBGI+r0wYqAg6tab33IYFo+3BgE0xwl1RX3SwX1pbPt3LVDi8zLA5mkmmmDiNIqqYa1vICDgRgu8OTCRcCCTaWB5DhVY11iZaYFyQEoQ+aUHp9QoYeH7Qmp+M2//+DYG9wka6kA=