adding accepted values for currency symbol pos.

Author: darrylhein

README.md

@@ -134,7 +134,7 @@ By default the decimal value is disabled, to use decimal value add `precision` p
 |Props|Description|Required|Type|Default|
 |-----|-----------|--------|----|-------|
 |currency|Currency prefix|false|String|-|
-|currency-symbol-position|Position for the symbol|false|String|'prefix'|
+|currency-symbol-position|Position for the symbol (accepted values: `prefix` or `suffix`)|false|String|'prefix'|
 |max|Maximum value allowed|false|Number, String|-|
 |min|Minimum value allowed|false|Number, String|0|
 |minus|Enable/disable minus value|false|Boolean|false|