[gold] Fix typo in readme file
[gold] Fix typo in readme file


TBR=rmistry
NOTRY=True

Bug: skia:
Change-Id: I2850fe18fe6eae0148c03a82d590fdf96a969736
Reviewed-on: https://skia-review.googlesource.com/20920
Reviewed-by: Stephan Altmueller <43343ec95731c0e8daa7359daf7f2f3935582b24@google.com>
Commit-Queue: Stephan Altmueller <43343ec95731c0e8daa7359daf7f2f3935582b24@google.com>

google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot