add -V option to 'got tag' usage string, and replace underscore with a hyphen
diff --git a/got/got.c b/got/got.c
index ce9c1f6..77e02b0 100644
--- a/got/got.c
+++ b/got/got.c
@@ -6909,7 +6909,7 @@ usage_tag(void)
{
fprintf(stderr,
"usage: %s tag [-c commit] [-r repository] [-l] "
- "[-m message] [-s signer_id] name\n",
+ "[-m message] [-s signer-id] [-V] name\n",
getprogname());
exit(1);
}