Adjust release-hook, check for tags with v prefix

Signed-off-by: Joachim Wiberg <troglobit@gmail.com>

Makefile.am

@@ -3,9 +3,9 @@ dist_doc_DATA       = ChangeLog.md README.md LICENSE
 
 ## Check if tagged in git
 release-hook:
-	@if [ ! `git tag -l $(PACKAGE_VERSION) | grep $(PACKAGE_VERSION)` ]; then	\
+	@if [ ! `git tag -l v$(PACKAGE_VERSION) | grep v$(PACKAGE_VERSION)` ]; then	\
 		echo;									\
-		printf "\e[1m\e[41mCannot find release tag $(PACKAGE_VERSION)\e[0m\n";	\
+		printf "\e[1m\e[41mCannot find release tag v$(PACKAGE_VERSION)\e[0m\n";	\
 		printf "\e[1m\e[5mDo release anyway?\e[0m "; read yorn;			\
 		if [ "$$yorn" != "y" -a "$$yorn" != "Y" ]; then				\
 			printf "OK, aborting release.\n";				\
@@ -14,7 +14,7 @@ release-hook:
 		echo;									\
 	else										\
 		echo;									\
-		printf "\e[1m\e[42mFound GIT release tag $(PACKAGE_VERSION)\e[0m\n";	\
+		printf "\e[1m\e[42mFound GIT release tag v$(PACKAGE_VERSION)\e[0m\n";	\
 		printf "\e[1m\e[44m>>Remember to push tags!\e[0m\n";			\
 		echo;									\
 	fi