fix!(deps): Drop virtual Nextcloud dependency

Minimum Nextcloud version is now documented in the readme.

Signed-off-by: Christoph Wurst <christoph@winzerhof-wurst.at>

Author: ChristophWurst

README.md

@@ -1,6 +1,6 @@
 # Nextcloud Testing
 
-Simple and fast unit and integration testing framework for Nextcloud, based on PHPUnit
+Simple and fast unit and integration testing framework for Nextcloud 17+, based on PHPUnit
 
 Features
 * Minimal setUp/tearDown overhead for unit tests

composer.json

@@ -14,9 +14,6 @@
         "phpunit/phpunit": "^8.0|^9.0",
         "php-webdriver/webdriver": "^1.9"
     },
-    "require-dev": {
-        "christophwurst/nextcloud": "^17.0"
-    },
     "autoload": {
         "psr-4": {
             "ChristophWurst\\Nextcloud\\Testing\\": "/"