Ignore ambiguous variable name errors

Author: lukelbd

.pre-commit-config.yaml

@@ -10,4 +10,4 @@ repos:
     - id: end-of-file-fixer
     - id: trailing-whitespace
     - id: flake8
-      args: ['--max-line-length=88', '--ignore=W503,E402']
+      args: ['--max-line-length=88', '--ignore=W503,E402,E741']

.travis.yml

@@ -38,7 +38,7 @@ install:
   - which python
 
 script:
-  - flake8 proplot docs --max-line-length=88 --ignore=W503,E402
+  - flake8 proplot docs --max-line-length=88 --ignore=W503,E402,E741
   - pushd docs
   - make html
   - popd