BREAKING CHANGE: update scala version to 3, support for scala 2.13+ will be dropped.

[andrewrigas]

Closes #64

[codecov]

Codecov Report

Attention: 33 lines in your changes are missing coverage. Please review.

Comparison is base (abcfae1) 89.92% compared to head (9058caf) 64.31%.

❗ Current head 9058caf differs from pull request most recent head 0b98bf9. Consider uploading reports for the commit 0b98bf9 to get more accurate results

Files	Patch %	Lines
...s/oath-core/src/main/scala/io/oath/JwtIssuer.scala	57.14%	6 Missing ⚠️
...rc/main/scala/io/oath/config/JwtIssuerConfig.scala	50.00%	6 Missing ⚠️
...th-core/src/main/scala/io/oath/config/config.scala	37.50%	5 Missing ⚠️
...oath-core/src/main/scala/io/oath/JwtVerifier.scala	0.00%	4 Missing ⚠️
...src/main/scala/io/oath/jsoniter_scala/syntax.scala	55.55%	4 Missing ⚠️
...th-circe/src/main/scala/io/oath/circe/syntax.scala	76.92%	3 Missing ⚠️
.../main/scala/io/oath/config/JwtVerifierConfig.scala	77.77%	2 Missing ⚠️
...src/main/scala/io/oath/utils/DecryptionUtils.scala	50.00%	1 Missing ⚠️
...src/main/scala/io/oath/utils/EncryptionUtils.scala	50.00%	1 Missing ⚠️
...th-core/src/main/scala/io/oath/utils/package.scala	90.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##             main     #127       +/-   ##
===========================================
- Coverage   89.92%   64.31%   -25.61%     
===========================================
  Files          24       21        -3     
  Lines         377      468       +91     
  Branches       24        2       -22     
===========================================
- Hits          339      301       -38     
- Misses         38      167      +129     

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