Add Laravel 7 support

Author: dmitry-ivanov

README.md

@@ -15,6 +15,7 @@ Laravel-specific testing helpers and asserts.
 
 | Laravel | Testing Tools                                                            |
 | ------- | :----------------------------------------------------------------------: |
+| 7.x     | [7.x](https://github.com/dmitry-ivanov/laravel-testing-tools/tree/7.x)   |
 | 6.x     | [6.x](https://github.com/dmitry-ivanov/laravel-testing-tools/tree/6.x)   |
 | 5.8.*   | [5.8.*](https://github.com/dmitry-ivanov/laravel-testing-tools/tree/5.8) |
 | 5.7.*   | [5.7.*](https://github.com/dmitry-ivanov/laravel-testing-tools/tree/5.7) |

composer.json

@@ -12,14 +12,14 @@
         "email": "dmitry.g.ivanov@gmail.com"
     }],
     "require": {
-        "php": "^7.2",
-        "illuminate/support": "^6.0",
-        "illuminate/database": "^6.0",
+        "php": "^7.2.5",
+        "illuminate/support": "^7.0",
+        "illuminate/database": "^7.0",
         "mockery/mockery": "^1.2"
     },
     "require-dev": {
-        "phpunit/phpunit": "^8.3",
-        "orchestra/testbench": "^4.0"
+        "phpunit/phpunit": "^8.4|^9.0",
+        "orchestra/testbench": "^5.0"
     },
     "autoload": {
         "psr-4": {