Update README.md (#5)

Some examples were showing string results, while they should have been numbers.

README.md

@@ -81,7 +81,7 @@ fill(start, stop, step, options, fn);
 
 ```js
 fill(1, 3)
-//=> ['1', '2', '3']
+//=> [1, 2, 3]
 
 fill('1', '3')
 //=> ['1', '2', '3']
@@ -90,7 +90,7 @@ fill('0', '-5')
 //=> [ '0', '-1', '-2', '-3', '-4', '-5' ]
 
 fill(-9, 9, 3)
-//=> [ '-9', '-6', '-3', '0', '3', '6', '9' ])
+//=> [ -9, -6, -3, 0, 3, 6, 9 ])
 
 fill('-1', '-10', '-2')
 //=> [ '-1', '-3', '-5', '-7', '-9' ]
@@ -184,4 +184,4 @@ Released under the [MIT license](https://github.com/jonschlinkert/fill-range/blo
 
 ***
 
-_This file was generated by [verb-generate-readme](https://github.com/verbose/verb-generate-readme), v0.1.30, on September 15, 2016._
+_This file was generated by [verb-generate-readme](https://github.com/verbose/verb-generate-readme), v0.1.30, on September 15, 2016._