Better gap randomizer

[N1ckn1ght]

Consider using min/max restrictions inside of random function, not outside;
E.g. now it will try to spawn in between [-x, x] and if 0 is minimum it'll have 50% chance of getting 0

Should've been randomed in between [0, x] in that case it's much less of a chance to have weird spawn like that in a row.

[captaincod]

Oh, I'm glad that someone knows how to go so far through such games - I lose on the first pipes during testing 😄 The gap has changed, there is a restriction on the minimum height - check the new release.