Resolve npm install warning for @types/diff deprecation

> npm warn deprecated @types/[email protected]: This is a stub types definition. diff provides its own type definitions, so you do not need this installed.

Related: #1828

Author: aoberoi

package-lock.json

@@ -2078,7 +2078,6 @@
     "@types/chai-as-promised": "^7.1.8",
     "@types/chai-subset": "^1.3.6",
     "@types/decompress": "^4.2.7",
-    "@types/diff": "^8.0.0",
     "@types/lcov-parse": "^1.0.2",
     "@types/lodash.debounce": "^4.0.9",
     "@types/lodash.throttle": "^4.1.9",