Move copyright to the top of files.

src/ftxui/dom/text.cpp

@@ -1,3 +1,6 @@
+// Copyright 2020 Arthur Sonzogni. All rights reserved.
+// Use of this source code is governed by the MIT license that can be found in
+// the LICENSE file.
 #include <algorithm>  // for min
 #include <memory>     // for make_shared
 #include <string>     // for string, wstring
@@ -176,7 +179,3 @@ Element vtext(std::wstring text) {  // NOLINT
 }
 
 }  // namespace ftxui
-
-// Copyright 2020 Arthur Sonzogni. All rights reserved.
-// Use of this source code is governed by the MIT license that can be found in
-// the LICENSE file.