Changed number to integer in sumAll (TheOdinProject#477)

Author: saadsultan7

05_sumAll/README.md

@@ -1,6 +1,6 @@
 # Exercise 05 - sumAll
 
-Implement a function that takes 2 positive integers and returns the sum of every number between (and including) them:
+Implement a function that takes 2 positive integers and returns the sum of every integer between (and including) them:
 
 ```javascript
 sumAll(1, 4) // returns the sum of 1 + 2 + 3 + 4 which is 10