Small formatting fixes after black update

update changelog for 0.8.3 release

[issue-788] Improve test

spdx3: element_writer: unindent creation information

[issue-815] fix CI for Python 3.7 on MacOS

Merge pull request #779 from armintaenzertng/issue-775-catch-json-dec…

Merge pull request #778 from armintaenzertng/issue-774-unhashable-type

Merge pull request #777 from armintaenzertng/issue-773-catch-file-not…

Merge pull request #799 from meretp/fix-tv-parser-annotator

Merge pull request #787 from stanislaw/stanislaw/requirement_type

[issue-771] fix license expression error handling in tag-value parser

update changelog for 0.8.2 release

Properly install tzdata for GitHub Actions.

add documentation about the code architecture

fix(validation): fix error generation in expression validator

Merge pull request #759 from HomagGroup/feature/encoding_compliance

fix(validation): also allow URLs in download locations

[issue-753] only allow lowercase values for FilesAnalyzed in tag-value

[issue-754] output FilesAnalyzed boolean in lowercase in tag-value

add encoding parameter for parsing files

update changelog for 0.8.1

[issue-744] implement validation of external license references

instantiate get_spdx_licensing() in a singleton module

expand url regex to allow for userinfo

fix additional lint errors in tests

add SPDX tech mailing list link to README

update README and CHANGELOG for the upcoming release

add script to publish from tag

set validate=True as default value in the rdf writer to be consistent…