support relative config filename

[eczajk1]

The plugin does not currently work if you try to use a custom config file that is in another folder. This PR attempts to fix that.

$ sls deploy --config ./services/myfile.yml
 
  Error --------------------------------------------------
 
  Error: ENOENT: no such file or directory, open '/mypath/myfile.yml'
      at Object.fs.openSync (fs.js:646:18)
      at Object.fs.readFileSync (fs.js:551:33)
      at readFileSync (/Users/me/.nvm/versions/node/v8.12.0/lib/node_modules/serverless/lib/utils/fs/readFileSync.js:7:24)
      at Utils.readFileSync (/Users/me/.nvm/versions/node/v8.12.0/lib/node_modules/serverless/lib/classes/Utils.js:84:12)
      at YamlParser.parse (/Users/me/.nvm/versions/node/v8.12.0/lib/node_modules/serverless/lib/classes/YamlParser.js:17:40)
      at ServerlessStepFunctions.yamlParse (/mypath/node_modules/serverless-step-functions/lib/yamlParser.js:17:8)
      at ServerlessStepFunctions.tryCatcher (/mypath/node_modules/bluebird/js/release/util.js:16:23)
      at Promise._settlePromiseFromHandler (/mypath/node_modules/bluebird/js/release/promise.js:547:31)
      at Promise._settlePromise (/mypath/node_modules/bluebird/js/release/promise.js:604:18)
      at Promise._settlePromiseCtx (/mypath/node_modules/bluebird/js/release/promise.js:641:10)
      at _drainQueueStep (/mypath/node_modules/bluebird/js/release/async.js:97:12)
      at _drainQueue (/mypath/node_modules/bluebird/js/release/async.js:86:9)
      at Async._drainQueues (/mypath/node_modules/bluebird/js/release/async.js:102:5)
      at Immediate.Async.drainQueues (/mypath/node_modules/bluebird/js/release/async.js:15:14)
      at runCallback (timers.js:810:20)
      at tryOnImmediate (timers.js:768:5)
      at processImmediate [as _immediateCallback] (timers.js:745:5)

[horike37]

@eczajk1
Thanks 🙏 LGTM.

[horike37]

🎉 This PR is included in version 2.12.0 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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