Upcase argument in description
Replace get-char-property with get-text-property

Emacs 24.4 (i.e. the current trunk) uses overlay for selected region, so
when a new region is set for probing, `get-char-property' returns
"region" face instead of the face of the char at point.

See (info "(elisp) Examining Properties") for details.
Update version (0.3.2) and package description