optimize build matrix

.travis.yml

@@ -27,27 +27,27 @@ php:
 
 ## Define all ENV vars to test with
 env:
-  - LARAVEL_VERSION="5.0.*" DB_TYPE="sqlite"
-  - LARAVEL_VERSION="5.1.*" DB_TYPE="sqlite"
-  - LARAVEL_VERSION="5.2.*" DB_TYPE="sqlite"
-  - LARAVEL_VERSION="5.3.*" DB_TYPE="sqlite"
-  - LARAVEL_VERSION="5.4.*" DB_TYPE="sqlite"
+  - LARAVEL_VERSION="5.0.*"
+  - LARAVEL_VERSION="5.1.*"
+  - LARAVEL_VERSION="5.2.*"
+  - LARAVEL_VERSION="5.3.*"
+  - LARAVEL_VERSION="5.4.*"
 
 matrix:
   fast_finish: true
   include:
     - php: 5.5
-      env: LARAVEL_VERSION="5.1.*" DB_TYPE="mysql"
+      env: LARAVEL_VERSION="5.1.*"
     - php: 5.6
       env: LARAVEL_VERSION="5.1.*" DB_TYPE="mysql"
     - php: 7.1
       env: LARAVEL_VERSION="5.4.*" DB_TYPE="mysql"
     - php: 7.1
-      env: LARAVEL_VERSION="dev-master" DB_TYPE="sqlite"
+      env: LARAVEL_VERSION="dev-master"
   allow_failures:
     - php: nightly
     - php: hhvm
-    - env: LARAVEL_VERSION="dev-master" DB_TYPE="sqlite"
+    - env: LARAVEL_VERSION="dev-master"
 
 ## Run Scripts before Install
 before_install: