Update license and version for yabridgectl

Easiest to just match yabridge itself.

tools/yabridgectl/Cargo.lock

@@ -399,7 +399,7 @@ checksum = "712e227841d057c1ee1cd2fb22fa7e5a5461ae8e48fa2ca79ec42cfc1931183f"
 
 [[package]]
 name = "yabridgectl"
-version = "0.1.0"
+version = "1.2.1"
 dependencies = [
  "aho-corasick",
  "clap",

tools/yabridgectl/Cargo.toml

@@ -1,8 +1,13 @@
 [package]
 name = "yabridgectl"
-version = "0.1.0"
+# This version is linked to yabridge's version for clarity's sake and because
+# there's not a lot going on here
+version = "1.2.1"
 authors = ["Robbert van der Helm <mail@robbertvanderhelm.nl>"]
 edition = "2018"
+description = "Optional command line helper to set up yabridge"
+repository = "https://github.com/robbert-vdh/yabridge"
+license = "GPL-3.0-or-later"
 
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 

tools/yabridgectl/src/main.rs

@@ -1,3 +1,19 @@
+// yabridge: a Wine VST bridge
+// Copyright (C) 2020  Robbert van der Helm
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
 fn main() {
     println!("Hello, world!");
 }