dates-to-months

https://github.com/noamross/zero-dependency-problems/blob/master/R/dates-to-months.md

>    6/9/2013 1:15
>    7/9/2013 1:15
> 
> I have a series of data in a column of this format.
> 
> I am trying to convert it into a month and store it in a different column.
> 
> How can I do it?
> 
>   Intended output
> 
>    June
>    July
