docs: fix typo in the README (microsoft#641)

Marketionist · web-flow · commit ef1f86a02ad7 · 2021-04-23T10:32:52.000+02:00
diff --git a/README.md b/README.md
@@ -63,7 +63,7 @@ with sync_playwright() as p:
 
 #### Async API
 
-If you app is based on the modern asyncio loop and you are used to async/await constructs,
+If your app is based on the modern asyncio loop and you are used to async/await constructs,
 Playwright exposes Async API for you. You should use this API inside a Python REPL supporting `asyncio` like with `python -m asyncio`
 
 ```console
