Merge pull request #1640 from hubotio/windows-adapter-load-failure

fix(robot): Loading an adapter from file peridically fails on Windows.

src/robot.js

@@ -2,6 +2,7 @@
 const EventEmitter = require('events').EventEmitter
 const fs = require('fs')
 const path = require('path')
+const pathToFileURL = require('url').pathToFileURL
 
 const async = require('async')
 const pino = require('pino')
@@ -510,9 +511,9 @@ class Robot {
       if (Array.from(HUBOT_DEFAULT_ADAPTERS).indexOf(this.adapterName) > -1) {
         this.adapter = this.requireAdapterFrom(path.resolve(path.join(__dirname, 'adapters', this.adapterName)))
       } else if (['.js', '.cjs', '.coffee'].includes(ext)) {
-        this.adapter = this.requireAdapterFrom(path.resolve(adapterPath))
+        this.adapter = this.requireAdapterFrom(pathToFileURL(path.resolve(adapterPath)).pathname)
       } else if (['.mjs'].includes(ext)) {
-        this.adapter = await this.importAdapterFrom(path.resolve(adapterPath))
+        this.adapter = await this.importAdapterFrom(pathToFileURL(path.resolve(adapterPath)).href)
       } else {
         this.adapter = this.requireAdapterFrom(`hubot-${this.adapterName}`)
       }