release.sh: add example command lines

I tend to forget the command lines to release new packages. Record it in
the release script.

Signed-off-by: Shin'ichiro Kawasaki <kawasaki@juno.dti.ne.jp>

release.sh

@@ -4,7 +4,11 @@ usage() {
 	echo "Usage: ${0} COMMAND"
 	echo -e "COMMAND:"
 	echo -e "\tbuild"
+	echo -e "\tupload FILES"
 	echo -e "\tupload-testpypi FILES"
+	echo -e "examples:"
+	echo -e "\t${0} build"
+	echo -e "\t${0} upload dist/*0.2.6*"
 	exit 1
 }