Issue 4044 - Added handling for __future__ unicode_literals import to check_quotes()

flake8-abp/README.md

 # flake8-abp
 
 A [flake8](https://flake8.readthedocs.io) extension that checks for compliance
 with the [Adblock Plus coding style guide](https://adblockplus.org/coding-style#python)
 and some bad practices which flake8 doesn't handle by default.
 
 
 ## Installation
 
 Run `python setup.py install`.
@@ skipping 15 matching lines @@
 * `A104`: `map()` or `filter()` called with lambda function
 * `A105`: Type called with literal or comprehension where a
           literal/comprehension of that type can be used directly
 * `A106`: Use augment assignment
 * `A107`: `%` operator used for string formatting; this mechanism
           has been superseded by the string's `format()` method
 * `A108`: `+` operator to concatenate more than two strings
 * `A109`: Use triple double quotes for docstrings as recommended in PEP-257
 * `A110`: Write single-line string literals as represented by `repr()`
 * `A111`: Redundant parantheses around if or while condition
-* `A112`: String literals defined with 'u' prefixes and not with unicode_literals mode 
+* `A112`: Use `from __future__ import unicode_literals` instead of
+          prefixing literals with "u"
 
 
 ### Redundancy and complexity
 
 * `A201`: Redundant or superfluos `global` or `nonlocal` declaration
 * `A202`: Dead code after block is left
 * `A303`: Unused expression
 * `A204`: Redundant or superfluos pass statement
 * `A205`: Superfluos empty block
 * `A206`: Extraneous `else` statement after block is left
 * `A207`: Duplicate key in dict or set
 
 
 ### Error-prone practices
 
 * `A301`: Discouraged APIs
 * `A302`: Redefinition of built-in name
 * `A303`: Non-default source file encoding