Merge remote-tracking branch 'origin/develop' into breaking

solc/CommandLineInterface.cpp

@@ -14,6 +14,7 @@
 	You should have received a copy of the GNU General Public License
 	along with solidity.  If not, see <http://www.gnu.org/licenses/>.
 */
+// SPDX-License-Identifier: GPL-3.0
 /**
  * @author Lefteris <lefteris@ethdev.com>
  * @author Gav Wood <g@ethdev.com>