Updated dev dependencies and removed unused plugin.

index.js

 const fs = require("fs");
 const path = require("path");
-const async = require("async");
 const { spawn } = require("child_process");
 
 function parseCommand(librePath, cmd, convert) {

package.json

     "libreoffice",
     "keynote to image"
   ],
+  "repository": "https://github.com/kalimuthu-selvaraj/file-convert",
   "author": {
     "name": "Kalimuthu Selvaraj",
     "email": "kaalee6@gmail.com",
     "url": "https://github.com/kalimuthu-selvaraj"
   },
   "license": "ISC",
-  "dependencies": {
-    "async": "^3.2.0",
-    "chai-as-promised": "^7.1.1",
-    "nyc": "^15.1.0"
-  },
+  "dependencies": {},
   "devDependencies": {
     "babel-plugin-istanbul": "^6.0.0",
     "chai": "^4.0.0-canary.2",
+    "chai-as-promised": "^7.1.1",
     "coveralls": "^3.1.0",
     "cross-env": "^7.0.2",
     "istanbul": "^0.4.5",
-    "mocha": "^7.2.0"
+    "mocha": "^7.2.0",
+    "nyc": "^15.1.0"
   },
   "engines": {
     "node": ">=6"