Fix README formatting
Fix README formatting

This removes a few whitespaces and tabs.

kensipe/dcos-cli,kensipe/dcos-cli,kensipe/dcos-cli,kensipe/dcos-cli,kensipe/dcos-cli,dcos/dcos-cli,dcos/dcos-cli,dcos/dcos-cli,dcos/dcos-cli,dcos/dcos-cli