Update travis config for Laravel 6

Signed-off-by: Cy Rossignol <cy@rossignols.me>

Author: cyrossignol

.travis.yml

@@ -20,11 +20,14 @@ env:
   - LARAVEL_VERSION="5.7.*" HORIZON=1
   - LARAVEL_VERSION="5.8.*"
   - LARAVEL_VERSION="5.8.*" HORIZON=1
+  - LARAVEL_VERSION="6.0.*"
+  - LARAVEL_VERSION="6.0.*" HORIZON=1
   - LUMEN_VERSION="5.4.*"
   - LUMEN_VERSION="5.5.*"
   - LUMEN_VERSION="5.6.*"
   - LUMEN_VERSION="5.7.*"
   - LUMEN_VERSION="5.8.*"
+  - LUMEN_VERSION="6.0.*"
 
 matrix:
   exclude:
@@ -52,6 +55,12 @@ matrix:
       env: LARAVEL_VERSION="5.8.*" HORIZON=1
     - php: 5.6
       env: LUMEN_VERSION="5.8.*"
+    - php: 5.6
+      env: LARAVEL_VERSION="6.0.*"
+    - php: 5.6
+      env: LARAVEL_VERSION="6.0.*" HORIZON=1
+    - php: 5.6
+      env: LUMEN_VERSION="6.0.*"
     - php: 7.0
       env: LARAVEL_VERSION="5.5.*" HORIZON=1
     - php: 7.0
@@ -72,6 +81,18 @@ matrix:
       env: LARAVEL_VERSION="5.8.*" HORIZON=1
     - php: 7.0
       env: LUMEN_VERSION="5.8.*"
+    - php: 7.0
+      env: LARAVEL_VERSION="6.0.*"
+    - php: 7.0
+      env: LARAVEL_VERSION="6.0.*" HORIZON=1
+    - php: 7.0
+      env: LUMEN_VERSION="6.0.*"
+    - php: 7.1
+      env: LARAVEL_VERSION="6.0.*"
+    - php: 7.1
+      env: LARAVEL_VERSION="6.0.*" HORIZON=1
+    - php: 7.1
+      env: LUMEN_VERSION="6.0.*"
 
 before_install:
   - if [ -n "$LARAVEL_VERSION" ]; then composer remove --dev --no-update "laravel/lumen-framework"; fi