Add Topic classifiers

Author: Rishit-dagli

setup.py

@@ -21,12 +21,16 @@
         "Programming Language :: Python :: 3.7",
         "Programming Language :: Python :: 3.8",
         "Programming Language :: Python :: 3.9",
-        "Topic :: Scientific/Engineering :: Artificial Intelligence",
         "License :: OSI Approved :: Apache Software License",
-        "Intended Audience :: Developers"
-        "Intended Audience :: Education"
-        "Intended Audience :: Science/Research"
-
+        "Intended Audience :: Developers",
+        "Intended Audience :: Education",
+        "Intended Audience :: Science/Research",
+        "Topic :: Scientific/Engineering",
+        "Topic :: Scientific/Engineering :: Artificial Intelligence",
+        "Topic :: Software Development",
+        "Topic :: Software Development :: Libraries",
+        "Topic :: Software Development :: Libraries :: Python Modules",
+        "Topic :: Scientific/Engineering :: Mathematics"
     ],
 
     url="https://github.com/Rishit-dagli/Gradient-Centralization-TensorFlow",