added engine to package.json

Author: fabiantheblind

package.json

@@ -20,19 +20,7 @@
     "type": "git",
     "url": "https://github.com/ExtendScript/extendscriptr.git"
   },
-  "keywords": [
-    "automation",
-    "build",
-    "process",
-    "extendScript",
-    "indesign",
-    "illustrator",
-    "photoshop",
-    "adobe",
-    "es2105",
-    "es6",
-    "compile"
-  ],
+  "keywords": ["automation", "build", "process", "extendScript", "indesign", "illustrator", "photoshop", "adobe", "es2105", "es6", "compile"],
   "author": "vogelino",
   "license": "WTFPL",
   "bugs": {
@@ -60,5 +48,9 @@
     "commitizen": {
       "path": "./node_modules/cz-conventional-changelog"
     }
+  },
+  "engineStrict": true,
+    "engines": {
+      "npm": ">=3.0.0"
+    }
   }
-}