Adds a script to help automatically upgrading packages: this one can
patch name/version attributes like:
version = "50.1.0";
name = "bc-1.06";
... to the given version, and updates the sha256 hash to match.
Usage is:
update-source-version <attr> <new-version> [<new-source-hash>]
where:
- attr is the attribute path of the package
- new-version is the version string to be patched in
- new-source-hash is the optional sha256/etc. hash of the source.
If not given, the script will automatically calculate it.
This is added to a subdirectory where other useful scripts can be added
in the future, like figuring out the newest version from a git repo or
GitHub releases etc.
