Added README.md

3 jobs for master in 48 seconds (queued for 1 second)
Name Stage Failure
failed
build Build
Building Heroku-based application using gliderlabs/herokuish docker image...
invalid reference format
invalid reference format
invalid argument "/master:72ea968afe56f32f1c83e1dcbd9c633b794209b1" for "-t, --tag" flag: invalid reference format
See 'docker build --help'.
Running after_script
Uploading artifacts for failed job
Authenticating with credentials from /root/.docker/config.json
ERROR: Job failed: exit code 1