Bump src/collector:

Alex Suraci and Tim Labeeuw (1):
      add instance registry dea metrics

Elisabeth Hendrickson (2):
      Update README.md
      Still trying to get travis to build this.

Elisabeth Hendrickson and Mark Rushakoff (3):
      Fixed the reference to VCAP in the readme
      drop patch level to kick off build
      Whoops - fixing ruby version

Mark Rushakoff (2):
      Encapsulate historian adapters better
      Add Code Climate badge