Update the signing command (#67)

-amor was used instead of --amor

dev/sign.sh

diff --git a/dev/sign.sh b/dev/sign.sh
index e879cab..178ba3c 100755
--- a/dev/sign.sh
+++ b/dev/sign.sh
@@ -29,6 +29,6 @@
 
 for name in "${@}"
 do
-    gpg --yes -armor --local-user "$SIGN_WITH" --output "${name}.asc" --detach-sig "${name}"
+    gpg --yes --armor --local-user "$SIGN_WITH" --output "${name}.asc" --detach-sig "${name}"
     shasum -a 512 "${name}" > "${name}.sha512"
 done