feat: sns support custom arn

package.json

@@ -37,6 +37,7 @@
         "remove.ssocio": "sls remove --profile ssocio --stage prod",
         "!test": "----- run self-test with jest -----",
         "test": "LS=1 jest",
+        "!release": "----- release with standard -----",
         "release": "standard-version"
     },
     "dependencies": {

src/service/sns-service.js

@@ -84,10 +84,24 @@ module.exports = function(_$, name, options) {
 	};
 
 	/**
-	 * get arn string of this
+	 * get/set arn string of this
+	 *
+	 * ```js
+	 * // get default 'arn'
+	 * const = $sns().arn();
+	 *
+	 * // set 'arn' of 'lemon-hello-sns'
+	 * const old = $sns().arn('arn:aws:sns:111223344:lemon-hello-sns');
+	 * ```
 	 */
-	const arn = (name = 'lemon-hello-sns') => {
+	const arn = (_arn = undefined, name = 'lemon-hello-sns') => {
 		const arn = $arns[name];
+		//! set if _arn is defined.
+		if (_arn !== undefined) {
+			$arns[name] = _arn;
+			return Promise.resolve(arn); // returns old value.
+		}
+		//! return if cached.
 		if (arn) return Promise.resolve(arn);
 		return accountID().then(_ => {
 			_log(NS, '> account-id =', _);