setup.py updated

Author: arunsureshkumar

setup.py

@@ -2,35 +2,34 @@
 
 setup(
     name="graphene-mongo",
-    version="0.2.13",
+    version="0.3.1",
     description="Graphene Mongoengine integration",
     long_description=open("README.rst").read(),
     url="https://github.com/graphql-python/graphene-mongo",
     author="Abaw Chen",
     author_email="[email protected]",
     license="MIT",
     classifiers=[
-        "Development Status :: 4 - Beta",
+        "Development Status :: 1 - Beta",
         "Intended Audience :: Developers",
         "Topic :: Software Development :: Libraries",
-        "Programming Language :: Python :: 2.7",
-        "Programming Language :: Python :: 3.4",
-        "Programming Language :: Python :: 3.5",
         "Programming Language :: Python :: 3.6",
         "Programming Language :: Python :: 3.8",
+        "Programming Language :: Python :: 3.9",
         "Programming Language :: Python :: Implementation :: PyPy",
         "License :: OSI Approved :: MIT License",
     ],
     keywords="api graphql protocol rest relay graphene mongo mongoengine",
     packages=find_packages(exclude=["tests"]),
     install_requires=[
-        "graphene>=2.1.3,<3",
+        "graphene==3.0b7",
+        "promise==2.3",
         "mongoengine>=0.23.0",
         "singledispatch>=3.4.0.3",
         "iso8601>=0.1.12",
         'futures; python_version < "3.0"'
     ],
-    python_requires=">=2.7",
+    python_requires=">=3.6",
     zip_safe=True,
     tests_require=["pytest>=3.3.2", "mongomock", "mock"],
 )