add quotes around pip install command

Author: rongxin-liu

submit50/__main__.py

@@ -84,11 +84,11 @@ def check_version(package_name=__package__, timeout=5):
 
     # Check for minimum requirement
     if current < latest_io:
-        raise Error(_(f"Current version {current} of {package_name} is no longer supported. Run pip3 install --upgrade {package_name} now to upgrade."))
+        raise Error(_(f"Current version {current} of {package_name} is no longer supported. Run \"pip3 install --upgrade {package_name}\" now to upgrade."))
 
     # Check for latest version
     if latest_pypi > current:
-        cprint(f"A newer version of {package_name} is available. Run pip3 install --upgrade {package_name} to upgrade.", "magenta")
+        cprint(f"A newer version of {package_name} is available. Run \"pip3 install --upgrade {package_name}\" now to upgrade.", "magenta")
 
 
 def setup_logging(level):