v0.3.1

What's Changed

• extend WithRefOrSpec and add some tests by @SVilgelm in #42
• fix small error in doc for a Header struct by @SVilgelm in #45
• small fixes by @SVilgelm in #47

CI

• use go v1.21 by @SVilgelm in #41
• add the go v1.21 to the list of supported versions in README by @SVilgelm in #43
• Bump actions/checkout from 3 to 4 by @dependabot in #46
• Bump github/codeql-action from 2 to 3 by @dependabot in #49
• Bump actions/setup-go from 4 to 5 by @dependabot in #48
• Bump codecov/codecov-action from 3.1.4 to 4.0.1 by @dependabot in #51
• test go v1.22 by @SVilgelm in #52

Full Changelog: v0.2.2...v0.3.1