Remove `forkPingThread` callback from field `pendingOnAccept` of record `PendingConnect
Which prevents Snap from killing the connection by constantly sending pings.

Issue addressed here: https://github.com/jaspervdj/websockets-snap/issues/5
bump to 1.3.2.1
Merge pull request #199 from banacorn/master

Remove `forkPingThread` callback