add flake8 to lint precommit

.flake8

@@ -0,0 +1,14 @@
+[flake8]
+select =
+    E
+    W
+    F
+ignore =
+    W503 # makes Flake8 work like black
+    W504
+    E203 # makes Flake8 work like black
+    E741
+    E501 # long line checking is done in black
+exclude = test/
+per-file-ignores =
+    */__init__.py: F401

.pre-commit-config.yaml

@@ -1,6 +1,6 @@
 # Configuration for pre-commit hooks (see https://pre-commit.com/).
 
-exclude: ^(dbt/common/events/types_pb2.py)
+exclude: ^(dbt_common/events/types_pb2.py)
 
 # Force all unspecified python hooks to run python 3.8
 default_language_version:
@@ -27,13 +27,13 @@ repos:
     args:
     - "--check"
     - "--diff"
-# - repo: https://github.com/pycqa/flake8
-#   rev: 4.0.1
-#   hooks:
-#   - id: flake8
-#   - id: flake8
-#     alias: flake8-check
-#     stages: [manual]
+- repo: https://github.com/pycqa/flake8
+  rev: 4.0.1
+  hooks:
+  - id: flake8
+  - id: flake8
+    alias: flake8-check
+    stages: [manual]
 # - repo: https://github.com/pre-commit/mirrors-mypy
 #   rev: v1.4.1
 #   hooks:
@@ -50,11 +50,11 @@ repos:
 #     # author.
 #     # See https://github.com/pre-commit/pre-commit/issues/730 for details.
 #     args: [--show-error-codes]
-#     files: ^dbt/common/
+#     files: ^dbt_common/
 #     language: system
 #   - id: mypy
 #     alias: mypy-check
 #     stages: [manual]
 #     args: [--show-error-codes, --pretty]
-#     files: ^dbt/common
+#     files: ^dbt_common
 #     language: system