v0.7.0-rc0

First release candidate for the v0.7.0 release.
Release notes are to be reviewed and revised, the following is auto-generated by Github and is included to give a rough idea:

What's Changed

• [WIP] Add --signoff to README.md git commit references by @altendky in #121
• Fixes the install error in Python 2.7 and CircleCI error with Python 3.4.8 by @ShubhamKJha in #141
• Validated the RDF file by @Yash-Varshney in #142
• CommunityBridge Project by Yash Varshney by @Yash-Varshney in #148
• Fix typo by @mzfr in #82
• Tie click version for Python 2.x. by @licquia in #162
• test_jsonyamlxml_parser: remove deprecated json.load encoding argument by @cole-h in #159
• Update CircleCI xcode version to a supported one. by @licquia in #164
• Drop Python 2.7 and 32-bit testing on Appveyor. by @licquia in #166
• Support multiple packages per SPDX document. by @licquia in #168
• Fix write_tv example by @SantiagoTorres in #133
• python3.9 is only present on 2019 images which is not the default by @tardyp in #175
• Pytest + py2.7 support removal + CI fixes by @tardyp in #179
• Factorise parsing and conversion by @tardyp in #174
• Added missing FileType values allowed by spec by @njv299 in #187
• introduce message handler by @tardyp in #173
• add spdxlite 2.2 SBOM parsing support by @tardyp in #188
• Removed check that packages have SHA1 checksum, per spec by @njv299 in #183
• Create release 0.7.0 by @pombredanne in #189
• Fix minor typo #190 by @pombredanne in #194
• Bump xcode from 9.4.1 to 10.3.0 by @RodneyRichardson in #203
• Update README.md by @kestewart in #208
• Corrected the documentation in README.md by @HARDIK-TSH1392 in #210
• Remove python 3.6 support, and add python 3.10. by @RodneyRichardson in #205
• Bump xcode to 13.0.0 for the Mac tests. by @licquia in #226
• [issue-152] fix cli convertor and add testcase by @meretp in #235
• [issue-230] fix provided example to be valid by @meretp in #237
• [issue-222] fix parsing of tv-files with multiple packages by @meretp in #236
• Rework contributing info by @armintaenzertng in #248
• [issue-238] group annotations, reviews and relationships under one headline by @meretp in #245
• Fix up a few filesAnalyzed issues by @lhh in #195
• New implementation of has_optional_field by @armintaenzertng in #252
• Added .editorconfig according to PEP 8 by @KOLANICH in #157
• writers[rdf]: add an option to pass create_doc write by @nicoweidner in #253
• [issue-184] validate against json-spec by @meretp in #254
• Fix spelling and some docstring improvements by @jayvdb in #260
• Moved the metadata into setup.cfg. by @KOLANICH in #156
• writers[rdf, jsonyamlxml]: Add external package reference by @nicoweidner in #266
• Assorted bug fixes by @meretp in #270
• Issue 269: Add missing 2.3 package properties by @armintaenzertng in #271
• Make 2.3 optional properties optional by @armintaenzertng in #276
• [issue-281] fix parsing of file attribution text and add test by @meretp in #283
• Recover properties lost during conversion by @armintaenzertng in #279
• serialize/ deserialize annotations by @meretp in #280
• [tv-parser] fix parsing of annotation type by @meretp in #282
• add byte range and line ranges to snippet by @meretp in #273
• [issue-272] make properties in tv-writer optional by @meretp in #286
• Add package properties to tv by @armintaenzertng in #284
• Rename snippet properties by @armintaenzertng in #289
• Refine contribution guidelines by @nicoweidner in #293
• [issue-291] extract License and its subclasses to a separate file by @meretp in #292
• [issue-301] add new relationship_types by @meretp in #304
• [issue-299] allow single line of text in free form text by @meretp in #300
• [issue-239] make packages in document optional by @meretp in #303
• [issue-181] add files at document-level by @meretp in #288
• [issue-312] fix typo in attribution text parsing by @armintaenzertng in #313
• [issue-239] make packages and files in cli parser and jsonyamlxml-writer optional by @meretp in #308
• Add support for multiple file types and fix file type casing by @armintaenzertng in #310
• fix example scripts by @meretp in #318
• [issue-261] delete duplicated files by @meretp in #317
• Add multiple checksums by @meretp in #311
• [issue-185] fix bug in checksum by @meretp in #322
• [issue-326] fix output for licenses that are SPDXNone or NoAssert-objects by @meretp in #327
• [issue-328] jsonyamlxml: fix parsing of file copyright text by @meretp in #329
• [issue-330] fix parsing of relationships with DocumentRef by @meretp in #331
• terminate parsing of relationship if one of the ids isn't a string by @meretp in #334
• [issue-324] Add examples from spdx-spec, various bugfixes by @nicoweidner in #332

New Contributors

• @altendky made their first contribution in #121
• @ShubhamKJha made their first contribution in #141
• @Yash-Varshney made their first contribution in #142
• @mzfr made their first contribution in #82
• @licquia made their first contribution in #162
• @cole-h made their first contribution in #159
• @SantiagoTorres made their first contribution in #133
• @tardyp made their first contribution in #175
• @njv299 made their first contribution in #187
• @RodneyRichardson made their first contribution in #203
• @kestewart made their first contribution in #208
• @HARDIK-TSH1392 made their first contribution in #210
• @meretp made their first contribution in #235
• @lhh made their first contribution in #195
• @KOLANICH made their first contribution in #157
• @jayvdb made their first contribution in #260

Full Changelog: v0.6.1...v0.7.0-rc0