README.md: Updated copyright

Signed-off-by: Grzegorz Latosinski <glatosinski@antmicro.com>

Author: glatosinski

README.md

@@ -1,8 +1,8 @@
 # Zephelin Trace Viewer
 
-Copyright (c) 2025 [Analog Devices, Inc.](https://www.analog.com/en/index.html)
+Copyright (c) 2025-2026 [Analog Devices, Inc.](https://www.analog.com/en/index.html)
 
-Copyright (c) 2025 [Antmicro](https://www.antmicro.com)
+Copyright (c) 2025-2026 [Antmicro](https://www.antmicro.com)
 
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