v0.4.6

PALEOcopse v0.4.6

Diff since v0.4.5

Merged pull requests:

• fix test failures (#20) (@sjdaines)
• Migrate to PrecompileTools (#22) (@sjdaines)
• Bump codecov/codecov-action from 1 to 3 (#23) (@dependabot[bot])
• Bump actions/checkout from 2 to 3 (#24) (@dependabot[bot])
• Bump actions/cache from 1 to 3 (#25) (@dependabot[bot])
• Add option to control treatment of DIC in riverine fluxes (#26) (@sjdaines)