v0.1.22

SBMLToolkit v0.1.22

Diff since v0.1.21

Merged pull requests:

• enable dependabot for GitHub actions (#119) (@ranocha)
• Bump actions/checkout from 1 to 3 (#120) (@dependabot[bot])
• Bump actions/cache from 1 to 3 (#121) (@dependabot[bot])
• Bump codecov/codecov-action from 1 to 3 (#122) (@dependabot[bot])
• handle params with initialAssignment (#123) (@paulflang)
• add joss paper (#124) (@paulflang)
• Create draft-pdf.yml (#125) (@paulflang)
• Bump actions/upload-artifact from 1 to 3 (#126) (@dependabot[bot])