Update version and METADATA

Author: isuruf

appveyor.yml

@@ -31,7 +31,7 @@ environment:
       PYTHON_VERSION: 37-x64
     - BUILD_TYPE: "Debug"
       COMPILER: MinGW-w64
-      PYTHON_VERSION: 36-x64
+      PYTHON_VERSION: 310-x64
       WITH_SYMPY: no
     - BUILD_TYPE: "Release"
       COMPILER: MSVC15
@@ -43,7 +43,7 @@ environment:
     - BUILD_TYPE: "Release"
       COMPILER: MSVC15
       PLATFORM: "x64"
-      PYTHON_VERSION: 36-x64
+      PYTHON_VERSION: 310-x64
       CONDA_INSTALL_LOCN: C:\\Miniconda36-x64
       WITH_MPFR: yes
       WITH_MPC: yes

setup.py

@@ -7,8 +7,8 @@
 from distutils.command.build import build as _build
 
 # Make sure the system has the right Python version.
-if sys.version_info[:2] < (3, 6):
-    print("SymEngine requires Python 3.6 or newer. "
+if sys.version_info[:2] < (3, 7):
+    print("SymEngine requires Python 3.7 or newer. "
           "Python %d.%d detected" % sys.version_info[:2])
     sys.exit(-1)
 
@@ -214,15 +214,15 @@ def finalize_options(self):
 '''
 
 setup(name="symengine",
-      version="0.8.1",
+      version="0.9.0",
       description="Python library providing wrappers to SymEngine",
       setup_requires=['cython>=0.29.24'],
       long_description=long_description,
       author="SymEngine development team",
       author_email="[email protected]",
       license="MIT",
       url="https://github.com/symengine/symengine.py",
-      python_requires='>=3.6,<4',
+      python_requires='>=3.7,<4',
       zip_safe=False,
       cmdclass = cmdclass,
       classifiers=[
@@ -232,9 +232,9 @@ def finalize_options(self):
         'Topic :: Scientific/Engineering',
         'Topic :: Scientific/Engineering :: Mathematics',
         'Topic :: Scientific/Engineering :: Physics',
-        'Programming Language :: Python :: 3.6',
         'Programming Language :: Python :: 3.7',
         'Programming Language :: Python :: 3.8',
         'Programming Language :: Python :: 3.9',
+        'Programming Language :: Python :: 3.10',
         ]
       )

symengine/__init__.py

@@ -56,7 +56,7 @@ def lambdify(args, exprs, **kwargs):
         return Lambdify(args, *exprs, **kwargs)
 
 
-__version__ = "0.8.1"
+__version__ = "0.9.0"
 
 
 # To not expose internals