fix typo in check_python_deps.py

tools/check_python_deps.py

@@ -30,7 +30,7 @@ def wrong_version(module, modulename, minimum_version, installed_version):
 You are using """ + modulename + """-""" + installed_version + """ : """ + inspect.getfile(module) + """
 The minimum required version is : """ + minimum_version + """
 Please run \"""" + str(sys.executable) + """ setup.py install --user\" to upgrade
-If the problem persits, then """ + inspect.getfile(module) + """ is binding the newely installed version of """ + modulename + """
+If the problem persists, then """ + inspect.getfile(module) + """ is binding the newely installed version of """ + modulename + """
 You should either remove it, or use PYTHONPATH to manage your sys.path. If you decide to use PYTHONPATH, do it to run the ortools examples as well.
 Check https://docs.python.org/3/tutorial/modules.html#the-module-search-path from more information."""