adds additional augmented assignment statements (#4315) (#4331)

* adds additional augmented assignment statements (#4315)

* Per PR comments, revised CHANGELOG.md to note change and contributor info

automatic commit by git-black, original commits:
  d80646c

core/dbt/graph/selector_spec.py

@@ -142,7 +142,7 @@ def dict_from_single_spec(cls, raw: str):
         method_name, method_arguments = cls.parse_method(dct)
         meth_name = str(method_name)
         if method_arguments:
-            meth_name += '.' + '.'.join(method_arguments)
+            meth_name += "." + ".".join(method_arguments)
         dct["method"] = meth_name
         dct = {k: v for k, v in dct.items() if (v is not None and v != "")}
         if "childrens_parents" in dct:

core/dbt/parser/manifest.py

@@ -700,15 +700,15 @@ def build_manifest_state_check(self):
         key_list.sort()
         env_var_str = ""
         for key in key_list:
-            env_var_str += f'{key}:{config.project_env_vars[key]}|'
+            env_var_str += f"{key}:{config.project_env_vars[key]}|"
         project_env_vars_hash = FileHash.from_contents(env_var_str)
 
         # Create a FileHash of the env_vars in the project
         key_list = list(config.profile_env_vars.keys())
         key_list.sort()
         env_var_str = ""
         for key in key_list:
-            env_var_str += f'{key}:{config.profile_env_vars[key]}|'
+            env_var_str += f"{key}:{config.profile_env_vars[key]}|"
         profile_env_vars_hash = FileHash.from_contents(env_var_str)
 
         # Create a FileHash of the profile file