Add "allow-plugins" for composer.

Author: kszymukowicz

composer.json

@@ -50,7 +50,11 @@
     },
     "config": {
         "vendor-dir": ".Build/vendor",
-        "bin-dir": ".Build/bin"
+        "bin-dir": ".Build/bin",
+        "allow-plugins": {
+            "typo3/cms-composer-installers": true,
+            "typo3/class-alias-loader": true
+        }
     },
     "scripts": {
         "test-unit-v10": "TYPO3_PATH_ROOT=.test/v10/public/ ./.Build/bin/phpunit -c .Build/vendor/nimut/testing-framework/res/Configuration/UnitTests.xml Tests/Unit/",