Steven McCracken

@mikywan what do you think of my suggested addition?

> When the pagerView is `infinite`, collecting all `indexPaths` will be time-consuming. Any suggestions will be appreciative. @WenchaoD is that because of [this](https://github.com/WenchaoD/FSPagerView/blob/e535eb1a810dc76d99260a0ae3898f80ad73261e/Sources/FSPagerView.swift#L324)? that seems like an inefficient way to...