Merge pull request #85 from flyway/update-contribution-doc-link

Update README.md

Author: alistair-RG

README.md

@@ -5,7 +5,7 @@ Supported databases in this repository will be released as part of Flyway.
 
 ## Contributing
 
-Want to add support for a new database? [See our contributing docs for more information](https://documentation.red-gate.com/fd/flyway-community-database-support-233445293.html).
+Want to add support for a new database? [See our contributing docs for more information](https://flyway.github.io/flyway/documentation/communitydb).
 
 ## Versioning