Release 0.5.5 of the SPDX Maven Plugin

What's Changed

• add button with current published version in maven by @rhwood in #27
• Add onlyUseLocalLicenses parameter by @amCap1712 in #34
• Miscellaneous code refactoring by @amCap1712 in #32
• Bump junit from 4.10 to 4.13.1 by @dependabot in #30
• Bump junit from 4.12 to 4.13.1 in /src/test/resources/unit/app-bomination by @dependabot in #31
• Bump junit from 4.8.2 to 4.13.1 in /src/test/resources/unit/spdx-maven-plugin-test by @dependabot in #29
• Add CONTRIBUTING.md file by @goneall in #35
• Add option to generate optional checksums by @amCap1712 in #36
• Update the compiler version to resolve CI build failures by @goneall in #37
• Update README.md by @culmat in #40
• Add Github Actions workflows by @amCap1712 in #39
• Update POM file to deploy to sonotype by @goneall in #41
• Fix invalid 'onlyUseLocalLicenses' configuration by @ncuht in #42
• Update the SPDX Tools version by @goneall in #43

New Contributors

• @rhwood made their first contribution in #27
• @amCap1712 made their first contribution in #34
• @dependabot made their first contribution in #30
• @culmat made their first contribution in #40
• @ncuht made their first contribution in #42

Full Changelog: v0.5.4...v0.5.5