Add "fixme" as a valid purpose

[jesstelford]

Brings the behaviour into line with the documentation:

Never forget a // TODO or // FIXME again.

[changeset-bot]

🦋 Changeset is good to go

Latest commit: 721e090

We got this.

This PR includes changesets to release 10 packages

Name	Type
@markings/source-comments	Minor
@markings/source-react	Minor
@markings/types	Minor
@markings/test-project	Patch
@markings/cli	Patch
@markings/output-csv	Patch
@markings/output-html	Patch
@markings/output-json	Patch
@markings/react	Patch
@markings/test-utils	Patch

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[emmatown]

Could you make it so fixme comments have the purpose of fixme in https://github.com/Thinkmill/markings/blob/master/packages/source-comments/src/index.ts#L19 as well and revert the case insensitive check change?

re why case sensitivity for the prop: we control the Marking component, we can enforce how it works so let's just not have multiple ways to do the same thing.

(if you want to make the comment source case insensitive, that's fine imo because Markings can't really control what people think a todo comment is)

[jesstelford]

Have made those changes 👍

Will open a separate issue to discuss the case insensitivity. EDIT: #31