Allow dot inside a parenthesis

[egonelbre]

This code is reported as missing a dot due to the parenthesis:

package main

// Example is an example struct. (A side-comment.)
type Example struct{}

[tetafro]

Interesting, I didn't know this is grammatically correct to put whole sentences with period inside the parenthesis. But seems like it is :)
I'll fix it.

[tetafro]

Fixed in 0.4.5