Update README.md

Author: owjs3901

README.md

@@ -35,7 +35,7 @@ devup API feels like using `fetch`, but with superpowers:
 import { devupApi } from "devup-api";
 
 // create api instance
-const api = await devupApi("https://api.example.com");
+const api = devupApi("https://api.example.com");
 ```
 
 ### **2. Call endpoints — types are automatic**

packages/core/README.md

@@ -11,10 +11,8 @@ npm install @devup-api/core
 ## Usage
 
 ```typescript
-import { devupApiCore } from '@devup-api/core';
+import { devupApi } from '@devup-api/core';
 
-const core = new devupApiCore({
-  // options
-});
+const core = devupApi("https://example.com");
 ```