Merge pull request EasyPost#272 from EasyPost/fix_custom_info_create_…

…custom_items

fix: customs_info wrapping for customs_items

Merge pull request EasyPost#269 from EasyPost/v5.0.0

chore: prepare v5.0.0 for release

Merge pull request EasyPost#256 from EasyPost/metadata

feat: add carrier metadata beta endpoint

Merge pull request EasyPost#251 from EasyPost/v4.13.0

chore: prepare v4.13.0 for release

Merge pull request EasyPost#247 from EasyPost/v4.12.0

chore: prepare v4.12.0 for release

Merge pull request EasyPost#240 from EasyPost/v4.11.0

chore: prepare v4.11.0 for release

Merge pull request EasyPost#237 from EasyPost/v4.10.0

chore: prepare v4.10.0 for release

Merge pull request EasyPost#233 from EasyPost/v4.9.0

chore: prepare v4.9.0 for release

Merge pull request EasyPost#225 from EasyPost/v4.8.1

chore: prepares v4.8.1 for release

Merge pull request EasyPost#219 from EasyPost/v4.8.0

chore: prepares v4.8.0 for release