Fix a missing install command for the perfsuite env.

Author: Julian

tox.ini

@@ -23,7 +23,7 @@ whitelist_externals =
     mkdir
 commands =
     noextra: {envpython} -m pip install --disable-pip-version-check {toxinidir}
-    format,perf: {envpython} -m pip install --disable-pip-version-check '{toxinidir}[format]'
+    format,perf,perfsuite: {envpython} -m pip install --disable-pip-version-check '{toxinidir}[format]'
     formatnongpl: {envpython} -m pip install --disable-pip-version-check '{toxinidir}[format-nongpl]'
 
     # Ignore the deprecation warning until pypa/setuptools#3276 is released