Update README.md

README.md

@@ -58,7 +58,7 @@ export default class Friendz extends Component {
 #### Custom Tokens
 
 The `beginAsync` method also can receive a custom token, if you need to specifically define a token to represent your async operation. _Note_ - due to the nature of
-async operations, it's impossible to guarantee which order the `endAsync` calls will run. If you are making multiple `beginAsync`/`endAsync` calls wiithin a single
+async operations, it's difficult to determine which order the `endAsync` calls will run. If you are making multiple `beginAsync`/`endAsync` calls wiithin a single
 class or function, _you need to ensure the uniqueness of each async operation by ensuring the uniqueness of the tokens you provide_.
 
 The following code _will not_ guarantee uniqueness, as the two `endAsync` calls _may_ be called in succession: