add flake8 linting for crayons

.flake8

@@ -0,0 +1,2 @@
+[flake8]
+ignore = F822

.travis.yml

@@ -7,7 +7,9 @@ python:
   - '3.8-dev'
 
 install:
-  - pip install colorama
+  - pip install colorama flake8 flake8-bugbear
 
 script:
+  - flake8
   - python test_crayons.py
+  - python setup.py install

crayons.py

@@ -1,12 +1,5 @@
 # -*- coding: utf-8 -*-
-
-"""
-clint.colored
-~~~~~~~~~~~~~
-
-This module provides a simple and elegant wrapper for colorama.
-
-"""
+"""A simple and elegant wrapper for colorama."""
 
 import os
 import re
@@ -16,6 +9,7 @@ import colorama
 
 PY3 = sys.version_info[0] >= 3
 
+
 __all__ = (
     'red', 'green', 'yellow', 'blue',
     'black', 'magenta', 'cyan', 'white',
@@ -38,11 +32,13 @@ else:
 if os.getenv("TERM") == "dumb":
     DISABLE_COLOR = True
 
+
 class ColoredString(object):
     """Enhanced string for __len__ operations on Colored output."""
+
     def __init__(self, color, s, always_color=False, bold=False):
         super(ColoredString, self).__init__()
-        if not PY3 and isinstance(s, unicode):
+        if not PY3 and isinstance(s, unicode):  # noqa: F821
             self.s = s.encode('utf-8')
         else:
             self.s = s
@@ -74,7 +70,7 @@ class ColoredString(object):
                             getattr(colorama.Style, style),
                             self.s,
                             colorama.Fore.RESET,
-                            getattr(colorama.Style, 'NORMAL'))
+                            colorama.Style.NORMAL)
 
         if self.always_color:
             return c
@@ -118,7 +114,7 @@ class ColoredString(object):
 
 
 def clean(s):
-    strip = re.compile(r"([^-_a-zA-Z0-9!@#%&=,/'\";:~`\$\^\*\(\)\+\[\]\.\{\}\|\?\<\>\\]+|[^\s]+)")
+    strip = re.compile(r"([^-_a-zA-Z0-9!@#%&=,/'\";:~`\$\^\*\(\)\+\[\]\.\{\}\|\?\<\>\\]+|[^\s]+)")  # noqa: E501
     txt = strip.sub('', str(s))
 
     strip = re.compile(r'\[\d+m')
@@ -126,22 +122,25 @@ def clean(s):
 
     return txt
 
+
 _colors = {x: x.upper() for x in __all__[:-3]}
 _colors['normal'] = 'RESET'
 
 for key, val in _colors.items():
     function = eval(
-        'lambda s, always=False, bold=False: ColoredString("{}", s, always_color=always, bold=bold)'.format(val))
+        'lambda s, always=False, bold=False: ColoredString("{}", s, always_color=always, bold=bold)'.format(val))  # noqa: E501
     locals()[key] = function
 
 del key, val, _colors, function
 
+
 def disable():
     """Disables colors."""
     global DISABLE_COLOR
 
     DISABLE_COLOR = True
 
+
 def enable():
     """Enables colors."""
     global DISABLE_COLOR

setup.py

@@ -1,5 +1,6 @@
 #!/usr/bin/env python
 # -*- coding: utf-8 -*-
+"""setup script for module installation."""
 
 import os
 import sys