Add GPL-1.0 to Licenses

README.md

@@ -747,6 +747,7 @@ VPN software.
 - `CDDL-1.0` - [Common Development and Distribution License 1.0](https://spdx.org/licenses/CDDL-1.0.html)
 - `EPL-1.0` - [Eclipse Public License 1.0](https://spdx.org/licenses/EPL-1.0.html)
 - `GFDL-1.2` - [GNU Free Documentation License 1.2](https://spdx.org/licenses/GFDL-1.2.html)
+- `GPL-1.0` - [GNU General Public License 1.0](https://spdx.org/licenses/GPL-1.0.html)
 - `GPL-2.0` - [GNU General Public License 2.0](https://www.gnu.org/licenses/old-licenses/gpl-2.0.en.html)
 - `GPL-3.0` - [GNU General Public License 3.0](https://www.gnu.org/licenses/gpl-3.0.en.html)
 - `IPL-1.0` - [IBM Public License v1.0](https://spdx.org/licenses/IPL-1.0.html)