v0.5.0

Update to Prost 0.12.x series. This implements the new Name trait which can provide the type url in future. It is only partially implemented for now. Once fully stabilized, we need to see if it can potentially replace the type url method in MessageSerde (#53).

What's Changed

• added implementations for FieldMask by @qingshan in #44
• Update protox requirement from 0.3.1 to 0.4.1 by @dependabot in #46
• Fix deprecated use of DateTime::from_utc() by @Leulz in #55
• Update protox requirement from 0.4.1 to 0.5.0 by @dependabot in #52
• Update prost from 0.11.9 to 0.12.0 by @dragonnn in #53

Full Changelog: v0.4.2...v0.5.0