allow binaries in vendor folder to be cached

aka: don't delete binaries in node_modules folder, since they shouldn't change anyways (unless the package is also updated)

lib/install.js

@@ -1,30 +1,9 @@
 'use strict';
 
-const path = require('path');
 const bin = require('.');
 
-function getProjectRoot() {
-  // `projectRoot` on postinstall could be INIT_CWD introduced in npm >= 5.4
-  // see: https://github.com/npm/npm/issues/16990
-  const initCwd = process.env.INIT_CWD;
-  if (initCwd)
-    return initCwd;
-
-  // Fallback of getting INIT_CWD
-  const cwd = process.cwd();
-  const paths = cwd.split(path.sep);
-  // If `process.cwd` ends with 'node_modules/*' then get the dependent root directory,
-  // otherwise return the `cwd` (ordinary it will be the postinstall process of hugo-bin itself).
-  if (paths.length > 1 && paths[paths.length - 2] === 'node_modules')
-    return path.resolve('../../', cwd);
-
-  return cwd;
-}
-
-bin(getProjectRoot()).run(['version'])
-  .then(() => {
-    console.log('✔ Hugo installed successfully!');
-  })
-  .catch(error => {
-    console.error('✖ ERROR: Hugo installation failed. :(\n', error);
-  });
+bin.run(['version']).then(() => {
+  console.log('✔ Hugo installed successfully!');
+}).catch(error => {
+  console.error('✖ ERROR: Hugo installation failed. :(\n', error);
+});