Merge pull request #3386 from ivorpeles/master

Make isort fixer recognize auto_pipenv flag

doc/ale-python.txt

@@ -280,6 +280,15 @@ g:ale_python_isort_use_global                   *g:ale_python_isort_use_global*
   See |ale-integrations-local-executables|
 
 
+g:ale_python_isort_auto_pipenv                 *g:ale_python_isort_auto_pipenv*
+                                               *b:ale_python_isort_auto_pipenv*
+  Type: |Number|
+  Default: `0`
+
+  Detect whether the file is inside a pipenv, and set the executable to `pipenv`
+  if true. This is overridden by a manually-set executable.
+
+
 ===============================================================================
 mypy                                                          *ale-python-mypy*