Update copyright and license header.

I hereby assign to Claire Wolf the copyright for all work I did on `passes/cmds/exec.cc`.
In the event that this copyright assignment is not legally valid, I offer this work under the ISC license.

diff --git a/passes/cmds/exec.cc b/passes/cmds/exec.cc
index 7b5428f168d8643234904271bd3db7b21cacbf6a..399cb0ebb1e88228aad202d1c39cd0fb04590115 100644 (file)
--- a/passes/cmds/exec.cc
+++ b/passes/cmds/exec.cc
@@ -1,7 +1,7 @@
 /*
  *  yosys -- Yosys Open SYnthesis Suite
  *
- *  Copyright (C) 2012  Clifford Wolf <clifford@clifford.at>
+ *  Copyright (C) 2012 - 2020  Claire Wolf <claire@symbioticeda.com>
  *
  *  Permission to use, copy, modify, and/or distribute this software for any
  *  purpose with or without fee is hereby granted, provided that the above