Increase max attributes to 8

Author: grantjenks

.pylintrc

@@ -541,7 +541,7 @@ valid-metaclass-classmethod-first-arg=cls
 max-args=8
 
 # Maximum number of attributes for a class (see R0902).
-max-attributes=7
+max-attributes=8
 
 # Maximum number of boolean expressions in an if statement.
 max-bool-expr=5