Add license headers across the project

ts/updater/common.ts

@@ -1,3 +1,6 @@
+// Copyright 2019-2020 Signal Messenger, LLC
+// SPDX-License-Identifier: AGPL-3.0-only
+
 /* eslint-disable no-console */
 import {
   createWriteStream,

ts/updater/curve.ts

@@ -1,3 +1,6 @@
+// Copyright 2019-2020 Signal Messenger, LLC
+// SPDX-License-Identifier: AGPL-3.0-only
+
 import { randomBytes } from 'crypto';
 import {
   calculateSignature,

ts/updater/generateKeyPair.ts

@@ -1,3 +1,6 @@
+// Copyright 2019-2020 Signal Messenger, LLC
+// SPDX-License-Identifier: AGPL-3.0-only
+
 /* eslint-disable no-console */
 import { getCliOptions, getPrintableError } from './common';
 import { keyPair } from './curve';

ts/updater/generateSignature.ts

@@ -1,3 +1,6 @@
+// Copyright 2019-2020 Signal Messenger, LLC
+// SPDX-License-Identifier: AGPL-3.0-only
+
 /* eslint-disable no-console */
 import { join, resolve } from 'path';
 import { readdir as readdirCallback } from 'fs';

ts/updater/index.ts

@@ -1,3 +1,6 @@
+// Copyright 2019-2020 Signal Messenger, LLC
+// SPDX-License-Identifier: AGPL-3.0-only
+
 import { get as getFromConfig } from 'config';
 import { BrowserWindow } from 'electron';
 

ts/updater/macos.ts

@@ -1,3 +1,6 @@
+// Copyright 2019-2020 Signal Messenger, LLC
+// SPDX-License-Identifier: AGPL-3.0-only
+
 import { createReadStream, statSync } from 'fs';
 import { createServer, IncomingMessage, Server, ServerResponse } from 'http';
 import { AddressInfo } from 'net';

ts/updater/signature.ts

@@ -1,3 +1,6 @@
+// Copyright 2019-2020 Signal Messenger, LLC
+// SPDX-License-Identifier: AGPL-3.0-only
+
 import { createHash } from 'crypto';
 import {
   createReadStream,

ts/updater/windows.ts

@@ -1,3 +1,6 @@
+// Copyright 2019-2020 Signal Messenger, LLC
+// SPDX-License-Identifier: AGPL-3.0-only
+
 import { dirname, join } from 'path';
 import { spawn as spawnEmitter, SpawnOptions } from 'child_process';
 import { readdir as readdirCallback, unlink as unlinkCallback } from 'fs';