fix typo in README
fix typo in README


Former-commit-id: b20a69626569fb06a51bc15e75520a115ae9d67f
Webtrends/rundeck,scottymarshall/rundeck,scottymarshall/rundeck,scottymarshall/rundeck,Webtrends/rundeck,nilroy/rundeck,Webtrends/rundeck,nilroy/rundeck,nilroy/rundeck