Merge pull request #5 from digitalocean/composer-2

Update to Composer 2

composer.lock

@@ -58,6 +58,10 @@
             "keywords": [
                 "cowsay"
             ],
+            "support": {
+                "issues": "https://github.com/alrik11es/cowsayphp/issues",
+                "source": "https://github.com/alrik11es/cowsayphp/tree/master"
+            },
             "time": "2016-08-25T07:53:44+00:00"
         }
     ],
@@ -69,5 +73,5 @@
     "prefer-lowest": false,
     "platform": [],
     "platform-dev": [],
-    "plugin-api-version": "1.1.0"
+    "plugin-api-version": "2.0.0"
 }