Add license stuff to the top of caps/ and sno/ files I guess

irc/caps/constants.go

-// Package caps holds capabilities.
+// Copyright (c) 2017 Daniel Oaks <daniel@danieloaks.net>
+// released under the MIT license
+
 package caps
 
 // Capability represents an optional feature that a client may request from the server.

irc/caps/set.go

-// Package caps holds capabilities.
+// Copyright (c) 2017 Daniel Oaks <daniel@danieloaks.net>
+// released under the MIT license
+
 package caps
 
 import (

irc/caps/values.go

+// Copyright (c) 2017 Daniel Oaks <daniel@danieloaks.net>
+// released under the MIT license
+
 package caps
 
 import "sync"

irc/caps/version.go

+// Copyright (c) 2017 Daniel Oaks <daniel@danieloaks.net>
+// released under the MIT license
+
 package caps
 
 // Version is used to select which max version of CAP the client supports.

irc/sno/constants.go

+// Copyright (c) 2017 Daniel Oaks <daniel@danieloaks.net>
+// released under the MIT license
+
 // Package sno holds Server Notice masks for easy reference.
 package sno