add laravel 7 to travis

Author: pulkitjalan

.travis.yml

@@ -31,10 +31,22 @@ matrix:
       env: LARAVEL='6.*' COMPOSER_FLAGS='--prefer-lowest'
     - php: 7.4
       env: LARAVEL='6.*' COMPOSER_FLAGS='--prefer-stable'
+    - php: 7.2
+      env: LARAVEL='7.*' COMPOSER_FLAGS='--prefer-lowest'
+    - php: 7.2
+      env: LARAVEL='7.*' COMPOSER_FLAGS='--prefer-stable'
+    - php: 7.3
+      env: LARAVEL='7.*' COMPOSER_FLAGS='--prefer-lowest'
+    - php: 7.3
+      env: LARAVEL='7.*' COMPOSER_FLAGS='--prefer-stable'
+    - php: 7.4
+      env: LARAVEL='7.*' COMPOSER_FLAGS='--prefer-lowest'
+    - php: 7.4
+      env: LARAVEL='7.*' COMPOSER_FLAGS='--prefer-stable'
 
 before_install:
   - travis_retry composer self-update
-  - travis_retry composer require --no-update --no-interaction "illuminate/support:${LARAVEL}"
+  - travis_retry composer require "illuminate/support:${LARAVEL}" --no-update --no-interaction
 
 install:
   - travis_retry composer update ${COMPOSER_FLAGS} --prefer-dist --no-interaction --no-suggest

composer.json

@@ -35,7 +35,7 @@
     },
     "extra": {
         "branch-alias": {
-            "dev-master": "4.0.x-dev"
+            "dev-master": "4.1.x-dev"
         },
         "laravel": {
             "providers": [