message: fix decimal undefined message
diff: @@ -8,7 +8,7 @@ export default {
  between: (field, [min, max]) => `The ${field} field must be between ${min} and ${max}.`,
  confirmed: (field) => `The ${field} confirmation does not match.`,
  credit_card: (field) => `The ${field} field is invalid.`,
  - decimal: (field, [decimals] = ['*']) => `The ${field} field must be numeric and may contain ${decimals === '*' ? '' : decimals} decimal points.`,
  + decimal: (field, [decimals] = ['*']) => `The ${field} field must be numeric and may contain ${!decimals || decimals === '*' ? '' : decimals} decimal points.`,
  digits: (field, [length]) => `The ${field} field must be numeric and exactly contain ${length} digits.`,
  dimensions: (field, [width, height]) => `The ${field} field must be ${width} pixels by ${height} pixels.`,
  email: (field) => `The ${field} field must be a valid email.`,
  