add dlint and flake8-fixme

tox.ini

@@ -41,16 +41,18 @@ commands =
 # run style checks
 skip_install = true
 deps =
+    dlint
     flake8
     flake8-blind-except
     flake8-builtins
     flake8-docstrings
     flake8-executable
+    flake8-fixme
     flake8-isort
     flake8-logging-format
 commands =
     flake8
-    - flake8 --disable-noqa --select=E,W,F,C,D,A,G,B,I
+    - flake8 --disable-noqa --select=E,W,F,C,D,A,G,B,I,DUO
 
 [coverage:paths]
 source =
@@ -63,13 +65,13 @@ omit =
     **/_version.py
 
 [flake8]
-max-line-length = 120
 exclude =
     .tox/
     versioneer.py
     _version.py
     instance/
 max-complexity = 10
+max-line-length = 120
 
 [isort]
 line_length = 120