Placeholder format "decimalPatternDigit is not valid

## Expected Behavior

Expect placeholder format "decimalPatternDigits" to be accepted.

## Actual Behavior

Placeholder format "decimalPatternDigits" is not accepted by the static analysis of the ARB file

`Value is not accepted. Valid values: "compact", "compactCurrency", "compactSimpleCurrency", "compactLong", "currency", "decimalPattern", "decimalPercentPattern", "percentPattern", "scientificPattern", "simpleCurrency".`

## Steps to Reproduce the Problem

```arb
"priceDisplay": "{amount}",
"@priceDisplay": {
"placeholders": {
"amount": {
"type": "double",
"format": "decimalPatternDigits",
"optionalParameters": {
"decimalDigits": 2
},
"example": "49.99"
}
}
}
```
## Specifications

- Version: 0.0.13
- Platform: Windows