Added increment rounding to lume.round()

README.md

@@ -18,9 +18,14 @@ lume = require "lume"
 ### lume.clamp(x, min, max)
 Returns the value `x` clamped between the values `min` and `max`
 
-### lume.round(x)
+### lume.round(x [, increment])
-Rounds `x` to the nearest integer. Rounds away from zero if we're midway
+Rounds `x` to the nearest integer; rounds away from zero if we're midway
-between two integers.
+between two integers. If `increment` is set then the number is rounded to the
+nearest increment.
+```lua
+lume.round(2.3) -- Returns 2
+lume.round(123.4567, .1) -- Returns 123.5
+```
 
 ### lume.sign(x)
 Returns `1` if `x` is 0 or above, returns `-1` when `x` is negative.

lume.lua

@@ -15,7 +15,8 @@ function lume.clamp(x, min, max)
 end
 
 
-function lume.round(x)
+function lume.round(x, increment)
+  if increment then return lume.round(x / increment) * increment end
   return x > 0 and math.floor(x + .5) or math.ceil(x - .5)
 end