[webrtc-stats] new commits pushed by alvestrand

The following commits were just pushed by alvestrand to https://github.com/w3c/webrtc-stats:

* Change log, and make tidy (#186)

* Change log, and make tidy

Note that "make tidy" inserts an extra space for reasons unknown.
It is too tedious to remove it by hand, so it's left in.

* Change log finish and tidy
  by Harald Alvestrand
https://github.com/w3c/webrtc-stats/commit/1737344922110ebaaea0af8807240abd1c11a8cc