Bump to 2.0.0 (breaking change with JWT_PRIVATE_KEY)

Author: vimalloc

setup.py

@@ -6,7 +6,7 @@
 from setuptools import setup
 
 setup(name='Flask-JWT-Extended',
-      version='1.6.0',
+      version='2.0.0',
       url='https://github.com/vimalloc/flask-jwt-extended',
       license='MIT',
       author='Landon Gilbert-Bland',