proposed endpoint for article info api

elife_api_aricle_info_endpoint.yaml

  /articles/{doi}/pub_info:
    get:
      description: Get PDF file locations in JSON format.
      operationId: doi 
      produces:
        - application/json
      parameters:
        - name: doi
          in: path 
          description: FID of article
          required: true
          type: integer 
          format: int64 
      responses:
        '200':
          description: test response
          schema:
            type: array
            items:
              $ref: '#/definitions/pub_info'
              
definitions:
  pub_info:
    description: an array of version numbers 
    properties:
      doi: 
        type: string 
        description: Fid of the article 
      version: 
        type: integer 
        description: version of the document 
      update_date: 
        type: string 
        description: date that this version was updated on