package: bump `zuul-ngrok`
package: bump `zuul-ngrok`

ngrok@0.1.98 install fails, also does 0.1.99
[Bump ngrok@0.2.1 by cristiandouce](https://github.com/rase-/zuul-ngrok/pull/6)

AnyPresence/engine.io-client,socketio/engine.io-client,socketio/engine.io-client,juancancela/engine.io-client,enounca/engine.io-client,juancarloscancela/engine.io-client,nkzawa/engine.io-client,lwahonen/engine.io-client,socketio/engine.io-client,Automattic/engine.io-client,hellpf/engine.io-client