code: def patch_collection(self, collection, changes):
          
          uri = str.join('/', [self.uri, collection])
          return self.service._patch(uri, changes)
docs: Will make specific updates to a record based on JSON Patch
          documentation.
  
              https://tools.ietf.org/html/rfc6902
  
          the format of changes is something like::
  
              [{
                  'op': 'add',
                  'path': '/newfield',
                  'value': 'just added'
              }]