Rename state to zipCode to avoid confusion

Destructuring state using the regex was a little bit ambiguous since there is no state in the address (zip code instead).

Author: vasanthk

README.md

@@ -102,16 +102,17 @@ setTimeout(() => {
 **Bad:**
 ```javascript
 const address = 'One Infinite Loop, Cupertino 95014';
-const cityStateRegex = /^[^,\\]+[,\\\s]+(.+?)\s*(\d{5})?$/;
+const city
+Regex = /^[^,\\]+[,\\\s]+(.+?)\s*(\d{5})?$/;
 saveCityState(address.match(cityStateRegex)[1], address.match(cityStateRegex)[2]);
 ```
 
 **Good**:
 ```javascript
 const address = 'One Infinite Loop, Cupertino 95014';
-const cityStateRegex = /^[^,\\]+[,\\\s]+(.+?)\s*(\d{5})?$/;
-const [, city, state] = address.match(cityStateRegex);
-saveCityState(city, state);
+const cityZipCodeRegex = /^[^,\\]+[,\\\s]+(.+?)\s*(\d{5})?$/;
+const [, city, zipCode] = address.match(cityZipCodeRegex);
+saveCityState(city, zipCode);
 ```
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