v0.9.0

This release contains a minor change and one new exported function.

Improvements:

• The experimental github.com/bufbuild/protocompile/parser/fastscan package has been updated so it's even faster: it can scan in roughly half the time using a fourth as much memory as the previous version.

Additions:

• A new options.StripSourceRetentionOptionsFromFile helper function has been added, for use by tools that use the results of this compiler to do code generation. This function accepts a file descriptor and returns a modified version of it that has all options marked as "source" retention removed.