Avoid using deprecated inspect.getargspec()

eufy.py

@@ -2,7 +2,7 @@
 
 from cmd import Cmd
 from datetime import datetime, time
-from inspect import getargspec
+from inspect import signature, Signature
 from shlex import shlex
 from time import sleep
 
@@ -133,9 +133,9 @@ class EufyIR(EufyRawIR):
 def lexer(f):
     def g(self, args):
         argv = tuple(x.lower() for x in shlex(args))
-        s = getargspec(f)
-        maxargs = len(s.args or [])
-        minargs = maxargs - len(s.defaults or [])
+        s = signature(f)
+        maxargs = len(s.parameters)
+        minargs = len([x for _,x in s.parameters.items() if x.default is not Signature.empty])
         if minargs <= len(argv) + 1 <= maxargs:
             return f(self, *argv)
         else: