~rycee/svgsym

Update copyright year
Release version 0.1.2.0
Fix warnings in svgsym.cabal
Support multiple GHC versions in builds
Clean up sourcehut build manifest
Apply formatting
Use Nixpkgs's getExe for formatters
Bump Nix flake and update Cabal file
Use `use flake` in .envrc
Release version 0.1.1.0
Validate symbol regular expression

This checks that the regular expression is valid before attempting to
actually use it.
Extend allowed base versions

Mainly to allow building with GHC 8.10.
Minor readme fix

The Sourcehut Markdown renderer doesn't seem to support `sh-session`.
Use `console` instead.
Add date to changelog
Only export the `main` function
Add autogen-modules to Cabal file
Change package category

Also rename Cabal file to match package name.
Reformat Cabal file
Always use GHC 9.0.2

There is no need to build with other versions for now since we are
providing an executable, not a library.
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