Merge pull request #124 from mattpolzin/modernize

remove support for non-SwiftPM package managers. require Swift 6.0+.

Merge pull request #116 from mattpolzin/fix-optional-meta-omit-decode

Allow optional metadata to be omitted as well as nulled out.

Merge pull request #114 from mattpolzin/include15-support

support for Include15 type

Merge pull request #113 from mattpolzin/include14-support

add support for 14 includes

Merge pull request #103 from mattpolzin/add-include12-include13

Add Include12 and Include13 types.

Merge pull request #98 from mattpolzin/loosen-poly-requirement

Loosen podspec Poly requirement

Merge pull request #93 from mattpolzin/swift-5_4

Swift 5 4 CI

Merge pull request #87 from mattpolzin/release/v5

Release/v5

add better documentation on relationship metadata

Merge pull request #80 from mattpolzin/update-podspec-for-v-4

update podspec file for v 4