Update dependencies

Author: sebastianbergmann

composer.json

@@ -36,11 +36,11 @@
         "ext-xmlwriter": "*",
         "nikic/php-parser": "^5.4.0",
         "phpunit/php-file-iterator": "^6.0-dev",
-        "phpunit/php-text-template": "^4.0.1",
-        "sebastian/complexity": "^4.0.1",
-        "sebastian/environment": "^7.2.0",
-        "sebastian/lines-of-code": "^3.0.1",
-        "sebastian/version": "^5.0.2",
+        "phpunit/php-text-template": "^5.0-dev",
+        "sebastian/complexity": "^5.0-dev",
+        "sebastian/environment": "^8.0-dev",
+        "sebastian/lines-of-code": "^4.0-dev",
+        "sebastian/version": "^6.0-dev",
         "theseer/tokenizer": "^1.2.3"
     },
     "require-dev": {