chore: remove node_modules caching
chore: remove node_modules caching

With altered shrinkwrap and given the usual randomness of npm's magic,
it seems to bring more problems than solve. Especially given this
library is small and there's not _so_ much to cache.

apiaryio/dredd-transactions,apiaryio/dredd,apiaryio/dredd,apiaryio/dredd-transactions,apiaryio/dredd