Update tox.ini

Author: Cadair

tox.ini

@@ -36,9 +36,9 @@ changedir = docs
 description = invoke sphinx-build to build the HTML docs
 extras = docs
 allowlist_externals =
-  grep
-  rm
-  bash
+    grep
+    rm
+    bash
 commands =
     pip freeze
     sphinx-build -W -b html . _build/html {posargs}