update: CLASSIFIERS & KEYWORDS

Author: kozistr

setup.py

@@ -30,6 +30,7 @@ def read_version() -> str:
     'Intended Audience :: Developers',
     'Intended Audience :: Science/Research',
     'Programming Language :: Python :: 3',
+    'Programming Language :: Python :: 3.6',
     'Programming Language :: Python :: 3.7',
     'Programming Language :: Python :: 3.8',
     'Operating System :: OS Independent',
@@ -57,6 +58,8 @@ def read_version() -> str:
         'asam',
         'diffgrad',
         'diffrgrad',
+        'pcgrad',
+        'adamd',
     ]
 )