.travis.yml in airbrussh-1.1.1 vs .travis.yml in airbrussh-1.1.2

@@ -2,11 +2,24 @@
 rvm:
   - 1.9
   - 2.0
   - 2.1
   - 2.2
-  - 2.3.0
+  - 2.3.1
+  - 2.4.0
 env:
   - sshkit="master"
   - sshkit="= 1.7.1"
   - sshkit="= 1.6.1"
+matrix:
+  exclude:
+    # Older versions of SSHKit don't work with Ruby 2.4, so skip those
+    - rvm: 2.4.0
+      env: sshkit="= 1.7.1"
+    - rvm: 2.4.0
+      env: sshkit="= 1.6.1"
+  include:
+    # Run Danger only once, on 2.4.0
+    - rvm: 2.4.0
+      script: bundle exec danger
+
 before_install: gem install bundler --conservative --version '~> 1.10'