Fix: replace -> !! 和 replicate

原文
What length, take, drop, splitAt, !! and replicate have in common is ...
http://learnyouahaskell.com/modules#data-list
Fix: 負數 -> 相反數

原文中是
by whether they are negative or not
我並沒有找到negative可以表示相反數的依據，但根據下文的定義可以判斷這裏原文作者是想表達相反數的意思。
Merge pull request #43 from guoc/patch-4

Fix: replace -> !! 和 replicate
Merge pull request #45 from guoc/patch-6

Fix: 負數 -> 相反數
Update from original text

原文：
What length, take, drop, splitAt, !! and replicate have in common is that they take an Int as one of their parameters (or return an Int), ...
http://learnyouahaskell.com/modules#data-list
Conflicts:
	source/_posts/07-module.txt