www/p5-Dancer-Plugin-Swagger: update to 0.3.0

Maintaines's mail changed, and little update to 0.3.0:

From https://metacpan.org/dist/Dancer-Plugin-Swagger/changes :
0.3.0 2021-06-03
[ENHANCEMENTS]

• use Module::Version for API version munging. (GH#3, Mike Whitaker)

0.2.1 2021-05-30
[BUG FIXES]

• no default type for params defined by schema. (GH#2, Mike Whitaker)

PR: 277165