Update web hook library description
Update web hook library description

add Bitbucket support to web hooks library description.

https://github.com/go-playground/webhooks

SchumacherFM/awesome-go,husobee/awesome-go,avelino/awesome-go,subodhchhabra/awesome-go,chrislusf/awesome-go,vishr/awesome-go,QuentinPerez/awesome-go,bscott/awesome-go,Oire/awesome-go,joeybloggs/awesome-go,pconcepcion/awesome-go,theckman/awesome-go,shamsher31/awesome-go,h2non/awesome-go,jmelfi/awesome-go,sadlil/awesome-go,hvnsweeting/awesome-go,abhishekgahlot/awesome-go