run ruby 2.4.0 builds

Author: JonRowe

.travis.yml

@@ -33,6 +33,7 @@ script: "script/run_build 2>&1"
 
 rvm:
   - 1.8.7
+  - 2.4.0
   - 2.3.1
   - 2.2
   - 2.1
@@ -63,6 +64,10 @@ matrix:
       env: RAILS_VERSION=master
     - rvm: 2.3.1
       env: RAILS_VERSION=5-0-stable
+    - rvm: 2.4.0
+      env: RAILS_VERSION=master
+    - rvm: 2.4.0
+      env: RAILS_VERSION=5-0-stable
   exclude:
     # 3.0.x is not supported on MRI 2.0+
     - rvm: 2.0.0
@@ -73,6 +78,8 @@ matrix:
       env: RAILS_VERSION='~> 3.0.20'
     - rvm: 2.3.1
       env: RAILS_VERSION='~> 3.0.20'
+    - rvm: 2.4.0
+      env: RAILS_VERSION='~> 3.0.20'
     # 4.x is not supported on MRI ruby-1.8.7 or 1.9.2
     - rvm: 1.8.7
       env: RAILS_VERSION='~> 4.0.4'
@@ -103,6 +110,8 @@ matrix:
       env: RAILS_VERSION='~> 3.1.12'
     - rvm: 2.3.1
       env: RAILS_VERSION='~> 3.1.12'
+    - rvm: 2.4.0
+      env: RAILS_VERSION='~> 3.1.12'
   allow_failures:
     - rvm: 2.2.2
       env: RAILS_VERSION=master