add list of Python keywords (#88)

config/stub_templates/python/stub_config.toml

@@ -13,5 +13,12 @@ Word = "UNUSED"
 casing = "snake_case"
 allow_uppercase_vars = false
 keywords = [
-  "for"
+    # https://docs.python.org/3/reference/lexical_analysis.html#keywords
+    "False", "await", "else", "import", "pass",
+    "None", "break", "except", "in", "raise",
+    "True", "class", "finally", "is", "return",
+    "and", "continue", "for", "lambda", "try",
+    "as", "def", "from", "nonlocal", "while",
+    "assert", "del", "global", "not", "with",
+    "async", "elif", "if", "or", "yield",
 ]