Put ve-py3 before ve, so Python 3 executables will be preferred

autoload/ale/python.vim

@@ -4,8 +4,8 @@
 let g:ale_virtualenv_dir_names = get(g:, 'ale_virtualenv_dir_names', [
 \   '.env',
 \   'env',
-\   've',
 \   've-py3',
+\   've',
 \   'virtualenv',
 \])
 

doc/ale-python.txt

@@ -9,7 +9,7 @@ g:ale_virtualenv_dir_names                         *g:ale_virtualenv_dir_names*
                                                    *b:ale_virtualenv_dir_names*
 
   Type: |List|
-  Default: `['.env', 'env', 've', 've-py3', 'virtualenv']`
+  Default: `['.env', 'env', 've-py3', 've', 'virtualenv']`
 
   A list of directory names to be used when searching upwards from Python
   files to discover virtulenv directories with. For directory named `'foo'`,