title: marshmallow-sqlalchemy giving syntax error
body: <p>After installing <code>marshmallow-sqlalchemy</code> in python 3.5 it is showing me syntax error.</p>
  
  <p>I had install it using follow command <code>pip install marshmallow-sqlalchemy</code>.</p>
  
  <pre><code>Traceback (most recent call last):
    File "run.py", line 1, in &lt;module&gt;
      from app import flask_app
    File "/var/www/html/mswipe-banner/mswipe-banner/app/__init__.py", line 10, in &lt;module&gt;
      from .models import *
    File "/var/www/html/mswipe-banner/mswipe-banner/app/models/__init__.py", line 1, in &lt;module&gt;
      from .banner import *
    File "/var/www/html/mswipe-banner/mswipe-banner/app/models/banner.py", line 1, in &lt;module&gt;
      from .base_model import *
    File "/var/www/html/mswipe-banner/mswipe-banner/app/models/base_model.py", line 1, in &lt;module&gt;
      from flask_marshmallow import Marshmallow
    File "/var/www/html/mswipe-banner/lib/python3.5/site-packages/flask_marshmallow/__init__.py", line 24, in &lt;module&gt;
      from . import sqla
    File "/var/www/html/mswipe-banner/lib/python3.5/site-packages/flask_marshmallow/sqla.py", line 13, in &lt;module&gt;
      import marshmallow_sqlalchemy as msqla
    File "/var/www/html/mswipe-banner/lib/python3.5/site-packages/marshmallow_sqlalchemy/__init__.py", line 1, in &lt;module&gt;
      from .schema import TableSchemaOpts, ModelSchemaOpts, TableSchema, ModelSchema
    File "/var/www/html/mswipe-banner/lib/python3.5/site-packages/marshmallow_sqlalchemy/schema.py", line 3, in &lt;module&gt;
      from .convert import ModelConverter
    File "/var/www/html/mswipe-banner/lib/python3.5/site-packages/marshmallow_sqlalchemy/convert.py", line 80
      ):
      ^
  SyntaxError: invalid syntax
  </code></pre>
  
  <p>Thank you </p>