Bump dependencies

Bump dependencies for laravel 7

README.md

@@ -62,6 +62,7 @@ Make sure you have the MongoDB PHP driver installed. You can find installation i
  5.7.x    | 3.4.x
  5.8.x    | 3.5.x
  6.x      | 3.6.x
+ 7.x      | 4.x
 
 Install the package via Composer:
 

composer.json

@@ -19,17 +19,17 @@
     ],
     "license": "MIT",
     "require": {
-        "illuminate/support": "^5.8|^6.0",
-        "illuminate/container": "^5.8|^6.0",
-        "illuminate/database": "^5.8|^6.0",
-        "illuminate/events": "^5.8|^6.0",
-        "mongodb/mongodb": "^1.4"
+        "illuminate/support": "^7.0",
+        "illuminate/container": "^7.0",
+        "illuminate/database": "^7.0",
+        "illuminate/events": "^7.0",
+        "mongodb/mongodb": "^1.6"
     },
     "require-dev": {
-        "phpunit/phpunit": "^6.0|^7.0|^8.0",
-        "orchestra/testbench": "^3.1|^4.0",
-        "mockery/mockery": "^1.0",
-        "doctrine/dbal": "^2.5",
+        "phpunit/phpunit": "^8.4",
+        "orchestra/testbench": "^5.0",
+        "mockery/mockery": "^1.3.1",
+        "doctrine/dbal": "^2.6",
         "cedx/coveralls": "^11.2"
     },
     "autoload": {