use flake8 config file

Author: willingc

.flake8

@@ -6,6 +6,7 @@
 # F401: module imported but unused
 # F403: import *
 # F811: redefinition of unused `name` from line `N`
+# F821:
 # F841: local variable assigned but never used
 # E402: module level import not at top of file
 # I100: Import statements are in the wrong order

.travis.yml

@@ -26,7 +26,7 @@ matrix:
     - name: "flake8"
       python: 3.6
       env:
-        - TEST_CMD="flake8 bookstore --count --ignore=E203,E731,F811,W503 --max-complexity=23 --max-line-length=104 --show-source --statistics"
+        - TEST_CMD="flake8 bookstore"
     - name: "py36"
       python: 3.6
       env: