update readme_other

Author: RobinHerbots

README_other.md

@@ -40,4 +40,11 @@ An VIN mask for entering valid VIN codes.
 Inputmask("vin").mask(selector);
 ```
 
+### SSN (Social security number)
+An SSN mask for entering valid SSN numbers.
+
+```javascript
+Inputmask("ssn").mask(selector);
+```
+
 You can find/modify/extend these aliases in the inputmask.extensions.js