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ci: enable travis npm cache (#110)

* ci: enable travis npm cache

* ci: upgrade travis version

Thanks @zerdos

* ci: switch to using yarn cache
A
Anmol Sethi committed
3e9d86ee91dc10e57a8aaefb20803799fc27848d
Parent: e418ecf
Committed by Kyle Carberry <kyle@kwc.io> on 3/8/2019, 5:21:11 PM