Releasing - notes for project maintainers

Ensure that What's New (whatsnew.html, plus beta.txt and production.txt) is all up-to-date (don't forget to remove "Beta" from the latest whatsnew.html entry!)
Ensure that the latest code built successfully on Travis and was published to the Beta track
Tag the latest commit - convention is e.g. release/3.9 for version 3.9
In the Google Play developer console, promote the beta build to production

Bump versionName in cyclestreets.app/build.gradle to the next release candidate
Clear the contents of beta.txt; add a new section in whatsnew.html for the next round of development.

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