v0.6.0

AlgebraicMultigrid v0.6.0

Diff since v0.5.1

Merged pull requests:

• Misc cleanup (no functional changes). (#92) (@fredrikekre)
• Create Invalidations.yml (#97) (@ranocha)
• enable dependabot for GitHub actions (#99) (@ranocha)
• Bump codecov/codecov-action from 1 to 3 (#100) (@dependabot[bot])
• Bump actions/checkout from 2 to 3 (#101) (@dependabot[bot])
• Bump actions/cache from 1 to 3 (#102) (@dependabot[bot])
• LinearSolve.jl coarse solve integration (#103) (@termi-official)
• CompatHelper: add new compat entry for LinearSolve at version 2, (keep existing compat) (#105) (@github-actions[bot])

Closed issues:

• Unqualified overload of Base.length leads to confusing LoadErrors (#59)
• Use sparse LU as a faster coarse solver than Pinv (#94)
• Inf on preconditioner \ b (#98)