remove repositories block from composer, update dep on environment

Author: krakjoe

composer.json

@@ -23,12 +23,6 @@
         "optimize-autoloader": true,
         "sort-packages": true
     },
-    "repositories": {
-        "environment": {
-            "type": "vcs",
-            "url": "https://github.com/krakjoe/environment"
-        }
-    },
     "prefer-stable": true,
     "require": {
         "php": "^7.1",
@@ -38,7 +32,7 @@
         "phpunit/php-token-stream": "^3.0.1",
         "phpunit/php-text-template": "^1.2.1",
         "sebastian/code-unit-reverse-lookup": "^1.0.1",
-        "sebastian/environment": "dev-pcov as 4.0.1",
+        "sebastian/environment": "^4.1",
         "sebastian/version": "^2.0.1",
         "theseer/tokenizer": "^1.1"
     },