[pre-commit.ci] auto fixes from pre-commit.com hooks

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perf-tests/README.md

@@ -26,7 +26,7 @@ Run the tests:
 * Use local Python3 installation (advised to use pyenv/virtualenv):
     ```bash
     $ cd perf_tests
-    $ pip install -r requirements.txt --no-deps   
+    $ pip install -r requirements.txt --no-deps
     $ pytest -v -s -m ap_perf --count=<INT>  --users=<INT> --hatch-rate=<INT> --time=<INT>
     ```