[Upgrade] Allow installing with Laravel 7 (#19)

* [Upgrade] Allow installing with Laravel 7

* Change version used in  Travis CI

Author: bramdevries

.travis.yml

@@ -3,7 +3,7 @@ language: php
 matrix:
   include:
     - php: 7.2
-      env: ILLUMINATE_VERSION=6.0.*
+      env: ILLUMINATE_VERSION=7.0.*
 
 before_install:
   - composer require "illuminate/cache:${ILLUMINATE_VERSION}" --no-update

composer.json

@@ -11,19 +11,19 @@
     ],
     "minimum-stability": "stable",
     "require": {
-        "php": ">=7.2",
-        "illuminate/cache": "^6.0",
-        "illuminate/config": "^6.0",
-        "illuminate/console": "^6.0",
-        "illuminate/database": "^6.0",
-        "illuminate/support": "^6.0",
+        "php": ">=7.2.5",
+        "illuminate/cache": "^7",
+        "illuminate/config": "^7",
+        "illuminate/console": "^7",
+        "illuminate/database": "^7",
+        "illuminate/support": "^7",
         "opensoft/rollout": "2.2.*"
     },
     "require-dev": {
         "friendsofphp/php-cs-fixer": "^2.1",
-        "illuminate/container": "^6.0",
+        "illuminate/container": "^7",
         "mockery/mockery": "^1.2",
-        "orchestra/testbench": "^4.0",
+        "orchestra/testbench": "^5.0",
         "php-coveralls/php-coveralls": "^2.1",
         "phpunit/phpunit": "^8.0",
         "squizlabs/php_codesniffer": "^2.8"