Docker command in README.MD is wrong - pullRedisOpenSourceStats

[Jitender Gahlot]

Below command is pointing to internal repo (*-internal) instead of ecstat

$ docker run -v $PWD:/ecstats docker.pkg.github.com/redislabs-solution-architects/**ec2rl-internal/**ec2rl-internal:latest python pullRedisOpenSourceStats.py /ecstats/sampleOSSPullInput.xlsx