Give reporter access to current testing.T

[bauersimon]

Proposal to change:

type Reporter interface {
	// Report is called when the approved and received file do not match.
	Report(approved, received string) bool
}

to

type Reporter interface {
	// Report is called when the approved and received file do not match.
	Report(t *testing.T, approved, received string) bool
}

(or introduce a separate interface to not break backward compatibility

[hownowstephen]

hey @bauersimon thanks for the suggestion! In general reporters shouldn't really need any further context about the test, they're designed to just be a handoff from approvals to a given diff tool, would you be able to provide a bit more detail about what you're trying to achieve with this interface change?