build: update cargo version 0.3.0

[bojand]

I will tag once merged which should trigger a release.

[paolobarbolini]

Wait, what about the rest of the changes?

[paolobarbolini]

I think I killed it in time. I thought we were supposed to put in the no_std changes as well before releasing v0.3

[bojand]

Oh sorry I think I misunderstood the plan. Thanks for catching it. 👍

Yes lets get the other changes in before 0.3.0. release.

[bojand]

I will revert this change and clean up the tags.

[ririsoft]

Indeed I am preparing a couple of pull requests which would be worth for a 0.3 release.
One related to the static API we already discussed in #11 and one which will allow to match an extension without a buffer (useful when you do not want to open the file)

[paolobarbolini]

Perfect. I'll send a PR for the no_std changes. I also want to refactor (map::MatcherType, String, String, Matcher) into a struct to make the code a bit easier to read.