MAINT: Update rules for new flake8

Author: effigies

setup.cfg

@@ -70,8 +70,7 @@ duecredit =
 pointclouds =
     pyntcloud
 style =
-    flake8 < 3.0
-    flake8-putty
+    flake8 >= 3.7.0
 test =
     pytest >= 4.4
     pytest-xdist >= 1.28

tox.ini

@@ -2,10 +2,9 @@
 max-line-length = 99
 doctests = False
 exclude=*build/
-putty-ignore =
-    */__init__.py : +F401
-    docs/conf.py : +E265
-    /^\s*\.\. _.*?: http/ : +E501
+per-file-ignores =
+    **/__init__.py : F401
+    docs/conf.py : E265
 
 [pytest]
 norecursedirs = .git