chore(widget-chat):remove grunt-jest dependency
chore(widget-chat):remove grunt-jest dependency

Dependency only needed in the main project file where grunt is run from.

bbender/spark-js-sdk,aimeex3/spark-js-sdk,CiscoHRIT/spark-js-sdk,CiscoHRIT/spark-js-sdk,nickclar/spark-js-sdk,bbender/spark-js-sdk,ciscospark/spark-js-sdk,bbender/spark-js-sdk,adamweeks/spark-js-sdk,ianwremmel/spark-js-sdk,ciscospark/spark-js-sdk,mwegman/spark-js-sdk,adamweeks/spark-js-sdk,tran2/spark-js-sdk,aimeex3/spark-js-sdk,tran2/spark-js-sdk,nickclar/spark-js-sdk,mwegman/spark-js-sdk,ianwremmel/spark-js-sdk,mwegman/spark-js-sdk,urbenlegend/spark-js-sdk,aimeex3/spark-js-sdk,adamweeks/spark-js-sdk,urbenlegend/spark-js-sdk