py-Routes: updated to 2.5.1

Release 2.5.1 (October 13, 2020)
* Add compatibility for Python 3.7+.

Release 2.5.0 (October 13, 2020)
* Add graceful fallback for invalid character encoding from request object. Patch by Phillip Baker.
* Enhanced performance for matching routes that share the same static prefix. Patch by George Sakkis.
* Fixed issue with child routes not passing route conditions to the Mapper.connect call. Patch by
  Robin Abbi.
* Fixed documentation to reflect default value for minimization. Patch by Marcin Raczy��ski.
* Allow backslash to escape special characters in route paths. Patch by Orhan Kavrako��lu.
* Resolve invalid escape sequences. Patch by Stephen Finucane.
* Remove support for Python 2.6, 3.3, and 3.4. Patch by Stephen Finucane.
* Remove obsolete Python 2.3 compat code. Patch by Jakub Wilk.

(adam)