Update libs, add getCurrencySymbol, update mapping

package.json

@@ -25,6 +25,5 @@
     "@types/jest": "^26.0.24",
     "tsdx": "^0.14.1",
     "typescript": "^4.3.5"
-  },
-  "dependencies": {}
+  }
 }

readme.md

@@ -33,7 +33,7 @@ yarn add simple-currency-format
 
 **Returns**: `string`, Formatted currency
 
-## Example:
+#### Example:
 
 ```javascript
 import { currencyFormat } from 'simple-currency-format';
@@ -49,6 +49,24 @@ console.log(currencyFormat(1000000, 'en-US', 'USD'));
 // $1, 000, 000;
 ```
 
+### getCurrencySymbol(currency)
+
+**Parameters**:
+
+**currency**: `string`, Currency code (i.e. EUR, USD, GBP)
+
+**Returns**: `string`, Currency symbol (i.e. kr, £)
+
+#### Example:
+
+```javascript
+import { getCurrencySymbol } from 'simple-currency-format';
+console.log(getCurrencySymbol('SEK'));
+// kr;
+console.log(getCurrencySymbol('GBP'));
+// £;
+```
+
 ## Credits
 
 - [Intl.js](https://github.com/andyearnshaw/Intl.js/): We use currency format data from this library.