.travis.yml in safemode-1.3.5 vs .travis.yml in safemode-1.3.6

@@ -1,13 +1,16 @@
 ---
+os: linux
+dist: xenial
+language: ruby
 rvm:
-  - 1.8.7
-  - 1.9.3
-  - 2.0.0
-  - 2.1.10
-  - 2.2.6
-  - 2.3.3
-  - 2.4.0
-  - 2.5.1
+  - 2.2
+  - 2.3
+  - 2.4
+  - 2.5
+  - 2.6
+  - 2.7
   - jruby-9
-before_install: gem install bundler
-sudo: false
+matrix:
+  allow_failures:
+    - rvm: jruby-9
+before_install: gem install bundler --version 1.17.3