Disable update-notifier (#609)

* Revert "Only show update notifications when loaded from npm (#606)"

This reverts commit 3ef666ba8d.

* Revert "Brought the update notification back"

This reverts commit 5d3d9d4f37.

bin/now.js

@@ -26,7 +26,7 @@ try {
 // Utilities
 const pkg = require('../lib/pkg')
 
-if (pkg._npmPkg) {
+if (!process.pkg) {
   const notifier = updateNotifier({ pkg })
   const update = notifier.update
 

lib/pkg.js

@@ -1,13 +1,10 @@
 /* eslint-disable import/no-unresolved */
 
-const path = require('path')
-const pkg = require('../package.json')
-
+let pkg
 try {
-  const distDir = path.dirname(process.execPath)
-  pkg._npmPkg = require(path.join(distDir, '../../package.json'))
+  pkg = require('../package.json')
 } catch (err) {
-  pkg._npmPkg = null
+  pkg = require('../../package.json')
 }
 
 module.exports = pkg