fun describe(dirty: Boolean, trimLeading: Boolean): String
Overrides Describer.describe
Replicates the git describe command. Never null, either returns a String or throws an exception
dirty - if true, the string "-dirty" is appended when there are modified files in the work tree compared to the HEAD
trimLeading - iff true, the leading character v is removed from the version number (if present)
Return
a string that describes the current HEAD of the git repository