length minus one (#241)

suggested by @mootari

Author: Fil

README.md

@@ -576,7 +576,7 @@ i = Generators.range(100)
 
 If *step* is omitted, it defaults to 1. If *start* is omitted, it defaults to 0. The *stop* value is exclusive; it is not included in the result. If *step* is positive, the last element is the largest *start* + *i* \* *step* less than *stop*; if *step* is negative, the last element is the smallest *start* + *i* \* *step* greater than *stop*. If the returned array would contain an infinite number of values, an empty range is returned.
 
-The arguments are not required to be integers; however, the results are more predictable if they are. The values in the returned array are defined as *start* + *i* \* *step*, where *i* is an integer from zero to one minus the total number of elements in the returned array. For example:
+The arguments are not required to be integers; however, the results are more predictable if they are. The values in the returned array are defined as *start* + *i* \* *step*, where *i* is an integer from zero to the total number of elements in the returned array minus one. For example:
 
 ```js
 Generators.range(0, 1, 0.2) // 0, 0.2, 0.4, 0.6000000000000001, 0.8