Update gitsync/README.md
Update gitsync/README.md

Change-Id: Ib0910f498234b10a75f25f4a1a7b2fc442ad9b39

bazelbuild/continuous-integration,bazelbuild/continuous-integration,bazelbuild/continuous-integration,bazelbuild/continuous-integration,bazelbuild/continuous-integration,bazelbuild/continuous-integration,bazelbuild/continuous-integration,bazelbuild/continuous-integration