.travis.yml in postfix_status_line-0.2.4 vs .travis.yml in postfix_status_line-0.2.5

@@ -1,8 +1,16 @@
 language: ruby
 rvm:
   - 2.0.0
   - 2.1
   - 2.2
+  - 2.3.0
+before_install:
+  - gem update bundler
+before_script:
+  - '[ "$DISABLE_OPENSSL" = "1" ] && sudo apt-get remove -y libssl-dev || true'
 script:
   - bundle install
   - bundle exec rake
+env:
+  - DISABLE_OPENSSL=0
+  - DISABLE_OPENSSL=1