Merge pull request #118 from snicklepickles/master

Fix bullet velocity

Author: tgdwyer

_chapters/asteroids.md

@@ -523,7 +523,7 @@ Now we define functions to create objects:
     return {
       id: `bullet${s.objCount}`,
       pos:s.ship.pos.add(d.scale(s.ship.radius)),
-      vel:s.ship.vel.add(d.scale(-2)),
+      vel:s.ship.vel.add(d.scale(2)),
       createTime:s.time,
       thrust:false,
       angle:0,