add support for upgrade from tag

acme.sh

@@ -6317,7 +6317,7 @@ _installOnline() {
     if ./$PROJECT_ENTRY install "$_nocron" "" "$_noprofile"; then
       _info "Install success!"
       _initpath
-      _saveaccountconf "UPGRADE_HASH" "$(_getMasterHash)"
+      _saveaccountconf "UPGRADE_HASH" "$(_getUpgradeHash)"
     fi
 
     cd ..
@@ -6327,19 +6327,27 @@ _installOnline() {
   )
 }
 
-_getMasterHash() {
+_getRepoHash() {
+  _hash_path=$1
+  shift
+  _hash_url="https://api.github.com/repos/acmesh-official/$PROJECT_NAME/git/refs/$_hash_path"
+  _get $_hash_url | tr -d "\r\n" | tr '{},' '\n' | grep '"sha":' | cut -d '"' -f 4
+}
+
+_getUpgradeHash() {
   _b="$BRANCH"
   if [ -z "$_b" ]; then
     _b="master"
   fi
-  _hash_url="https://api.github.com/repos/acmesh-official/$PROJECT_NAME/git/refs/heads/$_b"
-  _get $_hash_url | tr -d "\r\n" | tr '{},' '\n' | grep '"sha":' | cut -d '"' -f 4
+  _hash=$(_getRepoHash "heads/$_b")
+  if [ -z "$_hash" ]; then _hash=$(_getRepoHash "tags/$_b"); fi
+  echo $_hash
 }
 
 upgrade() {
   if (
     _initpath
-    [ -z "$FORCE" ] && [ "$(_getMasterHash)" = "$(_readaccountconf "UPGRADE_HASH")" ] && _info "Already uptodate!" && exit 0
+    [ -z "$FORCE" ] && [ "$(_getUpgradeHash)" = "$(_readaccountconf "UPGRADE_HASH")" ] && _info "Already uptodate!" && exit 0
     export LE_WORKING_DIR
     cd "$LE_WORKING_DIR"
     _installOnline "nocron" "noprofile"