Release v1.5.2

What's Changed - Brief Version

Enhancements

• Add memory bounded datumaro data format detect.
  (#1241)
• Set protobuf version constraint to 4.*
  (#1260)

What's Changed- Full Version

• Add memory bounded datumaro data format detect to release 1.5.1 by @vinnamkim in #1241
• Update protobuf version by @wonjuleee in #1248
• Update for 1.5.2 by @yunchu in #1250
• Update changelog and release note by @yunchu in #1256
• Set protobuf version constraint to 4.* by @yunchu in #1260

Full Changelog: v1.5.1...v1.5.2