Update README.md

Update example to include passing in KIDs.

It seems obvious but this cost me hours of debugging time, and a simple update like this will save others this time.

packages/oauth/oauth-client-node/README.md

@@ -48,9 +48,9 @@ const client = new NodeOAuthClient({
   // Used to authenticate the client to the token endpoint. Will be used to
   // build the jwks object to be exposed on the "jwks_uri" endpoint.
   keyset: await Promise.all([
-    JoseKey.fromImportable(process.env.PRIVATE_KEY_1),
-    JoseKey.fromImportable(process.env.PRIVATE_KEY_2),
-    JoseKey.fromImportable(process.env.PRIVATE_KEY_3),
+    JoseKey.fromImportable(process.env.PRIVATE_KEY_1, 'kid-1'),
+    JoseKey.fromImportable(process.env.PRIVATE_KEY_2, 'kid-2'),
+    JoseKey.fromImportable(process.env.PRIVATE_KEY_3, 'kid-3'),
   ]),
 
   // Interface to store authorization state data (during authorization flows)