Add @jfmengels as a contributor

Author: fabianmoronzirfas

.all-contributorsrc

@@ -0,0 +1,22 @@
+{
+  "projectName": "extendscriptr",
+  "projectOwner": "ExtendScript",
+  "repoType": "github",
+  "repoHost": "https://github.com",
+  "files": [
+    "README.md"
+  ],
+  "imageSize": 128,
+  "commit": true,
+  "contributors": [
+    {
+      "login": "jfmengels",
+      "name": "Jeroen Engels",
+      "avatar_url": "https://avatars1.githubusercontent.com/u/3869412?v=4",
+      "profile": "https://github.com/jfmengels",
+      "contributions": [
+        "doc"
+      ]
+    }
+  ]
+}

README.md

@@ -1,5 +1,6 @@
-# Extendscriptr
+# Extendscriptr  
 
+[![All Contributors](https://img.shields.io/badge/all_contributors-1-orange.svg?style=flat-square)](#contributors)
 [![npm version](https://badge.fury.io/js/extendscriptr.svg)](https://badge.fury.io/js/extendscriptr) [![Join the chat at https://gitter.im/vogelino/extendscriptr](https://badges.gitter.im/vogelino/extendscriptr.svg)](https://gitter.im/vogelino/extendscriptr?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge) [![travis](https://travis-ci.org/ExtendScript/extendscriptr.svg)](https://travis-ci.org/ExtendScript/extendscriptr)  
 
 Extendscriptr is NPM CLI module that allows you to benefit of many modern javascript features of es5 and es6 in a es3 extendscript environment.
@@ -47,3 +48,15 @@ https://github.com/vogelino/extendscriptr/issues
 
 ### License
 WTFPL - Do whatever the fuck you want
+
+## Contributors
+
+Thanks goes to these wonderful people ([emoji key](https://github.com/kentcdodds/all-contributors#emoji-key)):
+
+<!-- ALL-CONTRIBUTORS-LIST:START - Do not remove or modify this section -->
+<!-- prettier-ignore -->
+| [<img src="https://avatars1.githubusercontent.com/u/3869412?v=4" width="128px;"/><br /><sub><b>Jeroen Engels</b></sub>](https://github.com/jfmengels)<br />[📖](https://github.com/ExtendScript/extendscriptr/commits?author=jfmengels "Documentation") |
+| :---: |
+<!-- ALL-CONTRIBUTORS-LIST:END -->
+
+This project follows the [all-contributors](https://github.com/kentcdodds/all-contributors) specification. Contributions of any kind welcome!