Stay on correct major version for dependencies

Fixes #368

Author: Landon Gilbert-Bland

setup.py

@@ -30,8 +30,8 @@
       platforms='any',
       install_requires=[
           'Werkzeug>=0.14',  # Needed for SameSite cookie functionality
-          'Flask>=1.0',
-          'PyJWT>=1.6.4',
+          'Flask>=1.0,<2.0',
+          'PyJWT>=1.6.4,<2.0',
           'six',
       ],
       extras_require={