fix flynn run

README.md

@@ -22,7 +22,7 @@
 
     $ django-admin.py startproject --template=https://git.xxynet.com/pub/flynn-django-template/repository/archive.zip\?ref=master --name=Procfile appname
 
-    $ cd appname && pipenv install
+    $ cd appname && pipenv install && pipenv shell
 
 (windows如果失败, 将 `django-admin.py` 换为 `django-admin`)
 
@@ -40,7 +40,7 @@
     $ flynn create ``appname``
     $ git push flynn master
 
-    $ heroku run python manage.py migrate
+    $ flynn run python manage.py migrate
 
 参考python项目部署中文文档 [如何部署 Python 应用](https://flynn.mydoc.io/?t=54100)