[ANN] opam-package-upgrade 0.1: a small tool to migrate `opam` files to 2.0 format

Just like opam admin upgrade does for whole repository, this tiny tool is a more convenient way to migrate individual opam files (or all the files in a project).

Repository: https://github.com/AltGr/opam-package-upgrade
Use: opam package-upgrade [opam|NAME.opam|DIR...]

This is just a step in the ongoing migration to opam 2.0.
Note that, if you use opam 2.0 beta already, the opam files are migrated internally upon pinning the packge: keeping your source-tracked opam files in 1.2 format remains the more compatible option if you donā€™t need the new features.

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