add rule suggest for !t.Before -> t.After where t time.Time

[peakle]

No description provided.

[quasilyte]

Looking at the implementations of both of these functions, it looks like we save a few nanoseconds at most in case if compiler is not smart enough to inverse the comparison operator inside the function.

That could be a good fit in go-critic as a style linter though. We have boolExprSimplify checker there.