better credit to Peter "Hacking Math" Farell pointing to GitHub repo

sketch_180121b/sketch_180121b.pyde

@@ -2,7 +2,8 @@
 s18020b - Alexandre B A Villares
 https://abav.lugaralgum.com/sketch-a-day
 
-Slider code by Peter Farell (slight style mod by me)
+Slider code by Peter Farell (older version tweeked by me)
+https://github.com/hackingmath/python-sliders
 """
 from __future__ import division
 from slider import Slider

sketch_180121b/slider.py

@@ -3,8 +3,8 @@ Slider code by Peter Farell
 htts://twitter.com/hackingmath
 http://farrellpolymath.com/
 
-[ with very minor tweeks by Alexandre Villares
-  http://abav.lugaralgum.com ]
+Get the most recent version here:
+https://github.com/hackingmath/python-sliders 
 """
 # USAGE:
 #>from slider import Slider
@@ -72,4 +72,4 @@ class Slider:
         self.val = map(self.rectx, self.x, self.x + 120, self.low, self.high)
         # draw label
         popStyle()
-        return self.val
+        return self.val