[skip changelog] update copyright notice (#542)

Author: Massimiliano Pippi

Diff for: arduino/builder/builder.go

@@ -1,17 +1,17 @@
 // This file is part of arduino-cli.
 //
-// Copyright 2019 ARDUINO SA (http://www.arduino.cc/)
+// Copyright 2020 ARDUINO SA (http://www.arduino.cc/)
 //
 // This software is released under the GNU General Public License version 3,
 // which covers the main part of arduino-cli.
 // The terms of this license can be found at:
 // https://www.gnu.org/licenses/gpl-3.0.en.html
 //
 // You can be released from the requirements of the above licenses by purchasing
-// a commercial license. Buying such a license is mandatory if you want to modify or
-// otherwise use the software for commercial activities involving the Arduino
-// software without disclosing the source code of your own applications. To purchase
-// a commercial license, send an email to license@arduino.cc.
+// a commercial license. Buying such a license is mandatory if you want to
+// modify or otherwise use the software for commercial activities involving the
+// Arduino software without disclosing the source code of your own applications.
+// To purchase a commercial license, send an email to license@arduino.cc.
 
 package builder
 

Diff for: arduino/builder/builder_test.go

@@ -1,17 +1,17 @@
 // This file is part of arduino-cli.
 //
-// Copyright 2019 ARDUINO SA (http://www.arduino.cc/)
+// Copyright 2020 ARDUINO SA (http://www.arduino.cc/)
 //
 // This software is released under the GNU General Public License version 3,
 // which covers the main part of arduino-cli.
 // The terms of this license can be found at:
 // https://www.gnu.org/licenses/gpl-3.0.en.html
 //
 // You can be released from the requirements of the above licenses by purchasing
-// a commercial license. Buying such a license is mandatory if you want to modify or
-// otherwise use the software for commercial activities involving the Arduino
-// software without disclosing the source code of your own applications. To purchase
-// a commercial license, send an email to license@arduino.cc.
+// a commercial license. Buying such a license is mandatory if you want to
+// modify or otherwise use the software for commercial activities involving the
+// Arduino software without disclosing the source code of your own applications.
+// To purchase a commercial license, send an email to license@arduino.cc.
 
 package builder_test