Fix binary file

Author: NikolaiProgramist

bin/gendiff

@@ -28,15 +28,15 @@ ABOUT;
 
 
 $doc = <<<DOC
-Usage: differ v1.0
+Usage:
   gendiff (-h|--help)
   gendiff (-v|--version)
   gendiff [--format <fmt>] <firstFile> <secondFile>
 
 Options:
   -h --help                     Show this screen
   -v --version                  Show version
-  --format <fmt>                Report format [default: stylish]
+  -f --format <fmt>             Report format [default: stylish]
 DOC;
 
 $args = Docopt::handle($doc, array('version' => $about));