c95d9eef 

Add a serializer for `Github`

So it can do the right thing in hpack.
Time to Start Worker time Duration Time to finish
Config 0s 1s 1s 2s
Eval 3s 6s 6s 10s
Build 10s 1m08s 1m13s 1m24s
Suite 0s 1m17s 1m23s 1m24s