Update .stickler.yml

Update to use pyproject.toml as a config for black and not use any other linter

Author: Anand Sanmukhani

.stickler.yml

@@ -1,7 +1,5 @@
 ---
 linters:
-    pep8:
-        python: 3
-        max-line-length: 120
-        ignore: 'W503'
+    black:
+        config: ./pyproject.toml
         fixer: true