Update composer-plugin-api version to 2 (#9)

Co-authored-by: Michael van Nes <[email protected]>

Author: mvannes

composer.json

@@ -16,7 +16,7 @@
     },
     "require": {
         "php":                 ">=5.6",
-        "composer-plugin-api": "^1.0"
+        "composer-plugin-api": "^2.0.0"
     },
     "extra": {
         "class": "Hostnet\\Component\\Path\\Plugin"