fix badges in readme, gofmt, and minor linting fix #284
+20
−20
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README: update badge URLs
README: remove mentions of non-go-modules
This information is a bit outdated by now, and it's unlikely for anyone to still be using go1.10 or older.
internal/difflib: gofmt
internal/difflib: rename funcs that collided with built-ins
min, max are a builtin since go1.21; https://go.dev/doc/go1.21#language