Update ParseSession.js

Author: dblythy

src/ParseSession.js

@@ -2,8 +2,6 @@ import CoreManager from './CoreManager';
 import isRevocableSession from './isRevocableSession';
 import ParseObject from './ParseObject';
 import ParseUser from './ParseUser';
-
-import type { AttributeMap } from './ObjectStateMutations';
 import type { RequestOptions, FullOptions } from './RESTController';
 
 /**