Update README.md

Author: Natasha Rooney

maps/README.md

@@ -7,14 +7,14 @@ For this demo webapp you will need to [1] register a ServiceWorker, [2] when a u
 ### More Information / Requirements
 Please go ahead and make the app using the brief requirements above! If you want more details requirements see below:
 
-'''Zoom Levels'''
+**Zoom Levels**
 
 Need to consider what zoom levels of the map need to be downloaded including the zoom level the user is on.
 * It may make more sense that all zoom levels from the most granular the user is using and up is downloaded, rather then all levels.
 * EXAMPLE: (zoom levels 1-10) This means that if a user is viewing zoom level 5 (medium level of granularity) and they can see the whole of the UK then levels 5-10 will be downloaded (10 will be the whole Earth view). The user will not be able to zoom to levels 4,3,2,1 when offline as they did not visit these online.
 * This method helps to make sure in the instance when a user views the whole earth they also don’t accidently download all maps at all zoom levels
 
-'''Update'''
+**Update**
 
 One of the benefits of the web is the fact that the user always (or almost always) sees the most up to date version of any web-app or web-site. When we start introducing complex caching methods the issue arises of when a web-app’s assets have been updated then how does a “cached” web app know this has happened?