Remove incorrect license header that cobra added despite explicit flag to use GPLv3 :/

cmd/signald-cli/cmd/send.go

@@ -1,17 +1,3 @@
-// Copyright © 2018 Finn Herzfeld <finn@janky.solutions>
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//     http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
 package cmd
 
 import (