In R I have a data.frame and I'd like to do a bulk update.

My table looks like

```
Col1  Col2  Col3
A      123   456
A      789   012
B      345   678
B      789   012

```

I want to scan over the table and replace `A` with `"Apple"` and `B` with `"Banana"`

In my case, the list of replacements is quite long (~30 items) so I have them both in lists like:

```
old<-c('A','B')
new<-c('Apple','Banana')

```