BasicIntroduction While Loop - Scoping Fix

[mborowczak]

t = 0
while t < 5
  println(t)
  t+=1
end

Should become:

t = 0
while t < 5
  println(t)
  global t+=1
end

in order to avoid top-level scope errors.

[ChrisRackauckas]

thanks for pointing this out. Yeah, I am hoping that this just goes away sooner rather than later...