Only run WP_VERSION=trunk test once

This reduces the number of builds generated from 8 to 5.

Author: danielbachhuber

.travis.yml

@@ -11,22 +11,26 @@ branches:
   only:
     - master
 
-php:
-  - 7.1
-  - 7.0
-  - 5.6
-  - 5.3
-
 cache:
   - composer
   - $HOME/.composer/cache
 
 env:
   global:
     - WP_CLI_BIN_DIR=/tmp/wp-cli-phar
-  matrix:
-    - WP_VERSION=latest
-    - WP_VERSION=trunk
+
+matrix:
+  include:
+    - php: 7.1
+      env: WP_VERSION=latest
+    - php: 7.0
+      env: WP_VERSION=latest
+    - php: 5.6
+      env: WP_VERSION=latest
+    - php: 5.6
+      env: WP_VERSION=trunk
+    - php: 5.3
+      env: WP_VERSION=latest
 
 before_script:
   - composer validate