v3.1.0

SpecialMatrices v3.1.0

Diff since v3.0.0

Merged pull requests:

• Use https urls (#79) (@JeffFessler)
• Fix docs url (#80) (@JeffFessler)
• Fix links to "main" branch (#81) (@JeffFessler)
• Bump actions/checkout from 3 to 4 (#82) (@dependabot[bot])
• Bump actions/cache from 3 to 4 (#83) (@dependabot[bot])
• Bump codecov/codecov-action from 3 to 4 (#84) (@dependabot[bot])
• Standardize yml files / Polynomials v4 compat (#85) (@JeffFessler)
• Add Aqua tests; CODECOV_TOKEN (#86) (@JeffFessler)
• Add badges (#87) (@JeffFessler)
• To v3.1.0 (#89) (@JeffFessler)