mysql-native release 3.1.0

[Steven Schveighoffer]

Pleased to announce a slight update to 
[mysql-native](https://code.dlang.org/packages/mysql-native). This 
version adds logging, which can possibly help diagnose issues. If you 
use it with vibe, it will use vibe logging, otherwise it will use 
std.experimental.logger.

There are no API changes in this release. However, it had to wait until 
DMD v2.099.0 was released to avoid spamming unsuspecting users with log 
messages (see the [related 
change](https://dlang.org/changelog/2.099.0.html#logger_default_warning)).

Please file an issue if you find problems with the logging, or would 
like to see certain operations logged.

Kudos to SingingBush for making this a reality!

-Steve