v1.21.0

What's Changed

• Require a valid header segment when writing delimiter by @MikeEdgar in #276
• Add option to read as XML using implementation segment codes by @MikeEdgar in #280
• Validate control references and counters by @MikeEdgar in #301

Dependency Updates

• Bump jsonassert from 1.5.0 to 1.5.1 by @dependabot in #281
• Bump junit-jupiter from 5.8.2 to 5.9.0 by @dependabot in #287
• Bump mockito-core from 4.6.1 to 4.7.0 by @dependabot in #292
• Bump maven-javadoc-plugin from 3.4.0 to 3.4.1 by @dependabot in #293
• Bump jackson-core from 2.13.3 to 2.13.4 by @dependabot in #294
• Bump mockito-core from 4.7.0 to 4.8.0 by @dependabot in #295
• Bump maven-jar-plugin from 3.2.2 to 3.3.0 by @dependabot in #296
• Bump JAXB API and runtime to 4.0.0 by @MikeEdgar in #297
• Bump junit-jupiter from 5.9.0 to 5.9.1 by @dependabot in #298
• Bump Jakarta JSON API to 2.1.1 with legacy version for pre-Java 11 by @MikeEdgar in #299

Full Changelog: v1.20.0...v1.21.0