Fix http method of updateRichMenuAlias (#310)

Author: ssshun

lib/client.ts

@@ -326,7 +326,7 @@ export default class Client {
     richMenuAliasId: string,
     richMenuId: string,
   ): Promise<{}> {
-    const res = await this.http.put<{}>(
+    const res = await this.http.post<{}>(
       `${MESSAGING_API_PREFIX}/richmenu/alias/${richMenuAliasId}`,
       {
         richMenuId,

test/client.spec.ts

@@ -503,7 +503,7 @@ describe("client", () => {
   it("updateRichMenuAlias", async () => {
     const richMenuId = "test_rich_menu_id";
     const richMenuAliasId = "test_rich_menu_alias_id";
-    const scope = mockPut(
+    const scope = mockPost(
       MESSAGING_API_PREFIX,
       "/richmenu/alias/test_rich_menu_alias_id",
       { richMenuId },