doc/main.md: Update copyright year

obgm · May 11, 2022 · cfbf3ab · cfbf3ab
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@@ -4,7 +4,7 @@ libcoap                         {#mainpage}
 A C implementation of the Constrained Application Protocol (RFC 7252)
 =====================================================================
 
-Copyright (C) 2010--2021 by Olaf Bergmann <[email protected]> and others
+Copyright (C) 2010--2022 by Olaf Bergmann <[email protected]> and others
 
 About libcoap
 =============