Fixes travis build

docs/pages/api.rst

@@ -65,7 +65,8 @@ to understand how all components are bound together.
       Visitor->>Violation: Visitors raise violations when they find bad code
       Violation-->>flake8: Raised violations are shown to user by flake8
 
-We use a layered architecture that follows this contract:
+We use a `layered architecture <https://layer-linter.readthedocs.io/en/stable/concepts.html>`_
+that follows this contract:
 
 .. literalinclude :: ../../layers.yml
    :language: yaml

layers.yml

@@ -8,3 +8,4 @@ Linting process:
     - visitors
     - violations
     - logics
+    - options

wemake_python_styleguide/checker.py

@@ -47,13 +47,9 @@
 from wemake_python_styleguide import constants, types
 from wemake_python_styleguide import version as pkg_version
 from wemake_python_styleguide.options.config import Configuration
+from wemake_python_styleguide.presets import complexity, general, tokens
 from wemake_python_styleguide.transformations.ast_tree import transform
 from wemake_python_styleguide.visitors import base
-from wemake_python_styleguide.presets import (
-    complexity,
-    general,
-)
-from wemake_python_styleguide.presets import tokens
 
 VisitorClass = Type[base.BaseVisitor]