Fix collision between sticks and stones

Dear Players,

I hope you are enjoying this little game we made with my friend Clément. 

This morning I uploaded a new version of the game, now the stick does not collide anymore with the stones, which made it a bit annoying and more difficult.  

We also added a tiny bit more bounce to the stones physics, it was 0.4, and it is now 0.45.

In the coming update in a few days, we will add a shortcut button for the Reset on the "R" key.

and we will add an indication on the top of the screen of where the stone is if it goes off-screen.

Hope you are going to enjoy this game better with these additions. Let us know what you think and let us know your best score ;)

Charlie and Clément