fix: Remove unnecessary which dependency and code block in findBin.js

Apparently, `npm-which` already covers this for us so no need to implement $PATH lookup

package.json

@@ -51,8 +51,7 @@
     "listr": "^0.11.0",
     "minimatch": "^3.0.0",
     "npm-which": "^3.0.1",
-    "staged-git-files": "0.0.4",
-    "which": "^1.2.11"
+    "staged-git-files": "0.0.4"
   },
   "devDependencies": {
     "babel-core": "^6.10.4",

src/findBin.js

@@ -1,7 +1,6 @@
 'use strict'
 
 const npmWhich = require('npm-which')(process.cwd())
-const which = require('which')
 
 module.exports = function findBin(cmd, paths, packageJson, options) {
     const defaultArgs = ['--'].concat(paths)
@@ -46,15 +45,11 @@ module.exports = function findBin(cmd, paths, packageJson, options) {
     const args = parts.splice(1)
 
     try {
-        /* Firstly, try to resolve the bin in local node_modules/.bin */
+        /* npm-which tries to resolve the bin in local node_modules/.bin */
+        /* and if this fails it look in $PATH */
         bin = npmWhich.sync(bin)
     } catch (err) {
-        /* If this fails, try to resolve binary in $PATH */
-        try {
-            bin = which.sync(bin)
-        } catch (error) {
-            throw new Error(`${ bin } could not be found. Try \`npm install ${ bin }\`.`)
-        }
+        throw new Error(`${ bin } could not be found. Try \`npm install ${ bin }\`.`)
     }
 
     return {