Remove trailing foreward slash from clone url (#2091)
Remove trailing foreward slash from clone url (#2091)

The example/README.md has a trailing `/` after the clone URL
which if used in a terminal will result in error expressing
the repo cannot be found.
gdbelvin/trillian,gdbelvin/trillian,google/trillian,google/trillian,AlCutter/trillian,gdbelvin/trillian,AlCutter/trillian