release.nix: ci instructions now live in a separate repository
hledger-interest.cabal: avoid use of non-ascii characters
hledger-interest.cabal: the new hledger-lib release has been dubbed 0.20
hledger-interest.cabal: update tested-with field
hledger-interest.cabal: bump version number to 1.4.3
Merge changes from branch 'v1.4.x'.