fix: incorrect variable name in README.md (#313)

Corrected variable name from `identityLoader` to `myLoader`

Author: danielcaballero

README.md

@@ -339,7 +339,7 @@ so later requests will load new values.
 
 ```js
 const myLoader = new DataLoader(keys => {
-  identityLoader.clearAll()
+  myLoader.clearAll()
   return someBatchLoadFn(keys)
 })
 ```
@@ -666,4 +666,4 @@ To initiate the signature process please open a PR against this repo. The EasyCL
 
 You can find [detailed information here](https://github.com/graphql/graphql-wg/tree/main/membership). If you have issues, please email [[email protected]](mailto:[email protected]).
 
-If your company benefits from GraphQL and you would like to provide essential financial support for the systems and people that power our community, please also consider membership in the [GraphQL Foundation](https://foundation.graphql.org/join).
+If your company benefits from GraphQL and you would like to provide essential financial support for the systems and people that power our community, please also consider membership in the [GraphQL Foundation](https://foundation.graphql.org/join).