Fix typo in optmanager.py (#4825)
Fix typo in optmanager.py (#4825)

assigment -> assignment
Kriechi/mitmproxy,mitmproxy/mitmproxy,mhils/mitmproxy,mitmproxy/mitmproxy,mhils/mitmproxy,Kriechi/mitmproxy,mitmproxy/mitmproxy,mitmproxy/mitmproxy,mitmproxy/mitmproxy,mhils/mitmproxy,Kriechi/mitmproxy,Kriechi/mitmproxy,mhils/mitmproxy,mhils/mitmproxy