[housekeeping] Update README

README.md

@@ -141,7 +141,7 @@ This wouldn't have happened if 2nd listener was registered before the 1st.
 
 However, using a neat little trick will fix this.
 
-##### Suggestion - Cancelling using delay.
+##### Suggestion - Cancelling using delay
 
 Instead of `await subscriptionToBeCancelled.cancel();`, use
 
@@ -151,7 +151,6 @@ Future.delayed(Duration.zero, (){
 });
 ```
 
-
 ## Contributing
 
 We have some [Developer Notes](DeveloperNotes.md), but we're still learning too so they'll only help you so far, in fact there's probably a lot you can teach us!