chore(tox): update stubgen's output location

Author: cesarcoatl

tox.ini

@@ -28,7 +28,7 @@ skip_install = true
 deps =
     mypy[python2]@ git+https://github.com/coatl-dev/mypy.git@v0.971
 commands =
-    stubgen --export-less --output=..{/}stubs{/}stubs src
+    stubgen --export-less --output=stubs{/}stubs src
 
 [testenv:style]
 description = apply style