Update working_practices.html.md

Update Rubernecker url

source/team/working_practices.html.md

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 ## Pivotal Tracker and Rubbernecker
 
-We use [Pivotal Tracker](https://www.pivotaltracker.com/n/projects/1275640) to track stories and [Rubbernecker](https://rubbernecker.cloudapps.digital/) for an overview of stories currently being worked. Stories without a name assigned to them are available for you to work on. You should remove your name when moving a story to the next step (e.g. "doing" to "review").
+We use [Pivotal Tracker](https://www.pivotaltracker.com/n/projects/1275640) to track stories and [Rubbernecker](https://rubbernecker.london.cloudapps.digital/) for an overview of stories currently being worked. Stories without a name assigned to them are available for you to work on. You should remove your name when moving a story to the next step (e.g. "doing" to "review").
 
 ## Story states
 Within Pivotal Tracker there are a number of [story states](https://www.pivotaltracker.com/help/articles/terminology/#state) that let you know where in the cycle that piece of work is. When these stories are being worked, they appear in Rubbernecker. They appear under columns with different titles but when selecting a state in pivotal they move into the Rubbernecker columns like so: