Add missing slots for exceptions

Author: chillymosh

twitchio/ext/commands/exceptions.py

@@ -41,14 +41,17 @@
     "CommandOnCooldown",
     "ComponentLoadError",
     "ConversionError",
+    "ExpectedClosingQuoteError",
     "GuardFailure",
     "InputError",
+    "InvalidEndOfQuotedStringError",
     "MissingRequiredArgument",
     "ModuleAlreadyLoadedError",
     "ModuleLoadFailure",
     "ModuleNotLoadedError",
     "NoEntryPointError",
     "PrefixError",
+    "UnexpectedQuoteError",
 )