message: add release info to changelog
diff: # Unreleased Features
  Please add a note of your changes below this heading if you make a Pull Request.
  +# Releases
  +## [0.4.7] - 2018-11-28
  ### Added
  * Overspeed fault
  * Current sense saturation fault.
  @@ -19,7 +21,6 @@ Please add a note of your changes below this heading if you make a Pull Request.
  * Would get ERROR_CONTROL_DEADLINE_MISSED along with every ERROR_PHASE_RESISTANCE_OUT_OF_RANGE.
  * ODrive tool can now run interactive nested scripts with "%run -i script.py"
  -# Releases
  ## [0.4.6] - 2018-10-07
  ### Fixed
  * Broken printing of floats on ascii protocol
  