semver requires digits

tools/wget_semver

@@ -15,17 +15,16 @@ function usage() {
 }
 
 function get_github() {
-	local all_releases=$(git ls-remote --tags --sort="v:refname" git://github.com/$REPO_NAME)
+	local all_releases=$(git ls-remote --tags --sort="v:refname" git://github.com/$REPO_NAME | grep -Eo "v?([0-9]\.)+[0-9]+")
 
 	# extract only VERSION without 'v'
 	local non_v_release=$(echo "$all_releases" |
-		grep -v "refs/tags/v" | grep -v dev | grep -v rc | tail -n1 | cut -f2 | cut -d '/' -f3)
+		grep -v "refs/tags/v" | grep -v v | tail -n1 | cut -f2 | cut -d '/' -f3)
 	non_v_release=${non_v_release%^\{\}} # remove extra characters ^{} from github
 	[ -n "$non_v_release" ] && echo $non_v_release && return
 
 	# extract remaining version including 'v'
-	local v_release=$(echo "$all_releases" |
-		grep -v dev | grep -v rc | tail -n1 | cut -f2 | cut -d '/' -f3)
+	local v_release=$(echo "$all_releases" | tail -n1 | cut -f2 | cut -d '/' -f3)
 	v_release=${v_release%^\{\}} # remove extra characters ^{} from github
 	echo $v_release
 }