Inconsistent replace mode color

[zahimeen]

Not sure if this is a bug or intended feature.
Yet if it is a feature, my question is why?

The color of the replace mode changes because of certain actions.
When you first enter replace, it is the color of normal mode.
After you enter yank mode, replace mode is now the color of yank mode.
After you enter delete mode, replace mode is now the color of delete.

Once it changes color to yank or delete, it will not change back to normal.
It is not affected by any other modes.

[mvllow]

This should be fixed in #59 :)