fixed linting errors

Author: David

src/validationRules.js

@@ -30,10 +30,13 @@ const rules = {
         return allValid;
     },
     isNumber: (values, value) => {
-        switch(typeof value){
-            case 'string': return rules.matchRegexp(values, value, /^-?\d+\.?\d*$/);
-            case 'number': return true;
-            default: return false;
+        switch (typeof value) {
+        case 'string': 
+            return rules.matchRegexp(values, value, /^-?\d+\.?\d*$/);
+        case 'number': 
+            return true;
+        default: 
+            return false;
         }
     }
 };