Explicitly declare pyperclip requirement
Explicitly declare pyperclip requirement

pyperclip version 1.6.0 introduces an API change: the class `pyperclip.exceptions.PyperclipException` is moved to `pyperclip.PyperclipException`. As mitmproxy uses the latter, it's better to explicitly declare the requirement.
mhils/mitmproxy,Kriechi/mitmproxy,mitmproxy/mitmproxy,mitmproxy/mitmproxy,vhaupert/mitmproxy,mitmproxy/mitmproxy,ujjwal96/mitmproxy,ujjwal96/mitmproxy,zlorb/mitmproxy,cortesi/mitmproxy,Kriechi/mitmproxy,zlorb/mitmproxy,vhaupert/mitmproxy,cortesi/mitmproxy,mhils/mitmproxy,ujjwal96/mitmproxy,mhils/mitmproxy,mhils/mitmproxy,mitmproxy/mitmproxy,zlorb/mitmproxy,Kriechi/mitmproxy,vhaupert/mitmproxy,mitmproxy/mitmproxy,Kriechi/mitmproxy,vhaupert/mitmproxy,zlorb/mitmproxy,cortesi/mitmproxy,ujjwal96/mitmproxy,mhils/mitmproxy,cortesi/mitmproxy