chore: update email address in setup.py

Author: padamstx

setup.py

@@ -58,7 +58,7 @@ def run_tests(self):
       tests_require=tests_require,
       cmdclass={'test': PyTest},
       author='IBM',
-      author_email='devexdev@us.ibm.com',
+      author_email='devxsdk@us.ibm.com',
       long_description=readme,
       long_description_content_type='text/markdown',
       url='https://github.com/IBM/python-sdk-core',