README: Update SendData() usage in example

Jannis Pohlmann · Jannis Pohlmann · commit c8b63e00ab79 · 2018-01-04T23:24:24.000+01:00
diff --git a/README.md b/README.md
@@ -115,7 +115,7 @@ for _, conn := range subscriptions {
 			// Errors is optional ([]error)
 			Errors: graphqlws.ErrorsFromGraphQLErrors(result.Errors),
 		}
-		subscription.SendData(subscription, &data)
+		subscription.SendData(&data)
 	}
 }
 ```

Original file line number	Diff line number	Diff line change
`@@ -115,7 +115,7 @@ for _, conn := range subscriptions {`
`115`	`115`	`// Errors is optional ([]error)`
`116`	`116`	`Errors: graphqlws.ErrorsFromGraphQLErrors(result.Errors),`
`117`	`117`	`}`
`118`		`- subscription.SendData(subscription, &data)`
	`118`	`+ subscription.SendData(&data)`
`119`	`119`	`}`
`120`	`120`	`}`
`121`	`121`	```