[self update] - Don't clear the terminal screen

[mikeymike]

When invoking self update it seems to clear the terminal on each output so scrolling back up your terminal after an update shows a lot of whitespace.

I feel that it could all happily be displayed without clearing the terminal at all.

[jflanaganuk]

I could look at this if its still an issue, but you can run it (as of december) with the -y flag and it wont clear your terminal? #72

[mikeymike]

I just thought in general it wasn't required. Thanks for the tip though re -y

[jflanaganuk]

@mikeymike #94 if you would like to do the honours 👍