Constraints of scalar array item types are missing

[deiteris]

Found during #26.

The same RAML, but the string item contains some constraints:

#%RAML 1.0

title: Example API
version: v1
mediaType:
  - application/json

/example:
  get:
    body:
      type: object
      properties:
        customArray:
          type: array
          minItems: 1
          maxItems: 7
          uniqueItems: true
          items:
            type: string
            pattern: ^.*?$
            minLength: 0
            maxLength: 20

Results in no string constraints displayed for the Array of String type in the API console.