fixup! Change user agent

Author: atm-snag2

src/lib/get-qiita-api-instance.ts

@@ -14,12 +14,8 @@ export const getQiitaApiInstance = async (options?: { token?: string }) => {
   return qiitaApi;
 };
 
-const accessToken = async (options?: { token?: string }) => {
-  const { token } = options || { token: undefined };
-  const { accessToken } =
-    token === undefined ? await config.getCredential() : { accessToken: token };
-  return accessToken;
-};
+const accessToken = async (options?: { token?: string }) =>
+  options?.token ?? (await config.getCredential()).accessToken;
 
 const userAgent = () => {
   return `${PackageSettings.userAgentName}/${PackageSettings.version}`;