Prior to this PR, if there was a newline (or multiple newline
characters) at the end of the keyword then it wouldn't match. With this
fix any number of newlines at the end of the keyword match will now be
considered for approve or deny.
* Allow approval of a worflow with a set number of approvals
* update action interface
* Added test for when not enough approvals have been registered and minimumApprovals is set
* Warning raised by invalid minimumApprovals value should be an error
* update new input name to use hyphens
* Input env variable does in fact contain hyphens
