refactored isProperFraction function to handle negative numbers, tests now pass

Author: marscancode

implement-and-rewrite-tests/implement/2-is-proper-fraction.js

@@ -14,9 +14,9 @@
 // execute the code to ensure all tests pass.
 
 export function isProperFraction(numerator, denominator) {
-  if(numerator < denominator){
+  if (Math.abs(numerator) < Math.abs(denominator)) {
     return true;
-  } else{
+  } else {
     return false;
   }
 }