[docs] Update copyright years

Author: PaulBone

LICENSE

@@ -4,7 +4,7 @@ Code
 
 The code except for lex.* are:
 
-    Copyright (C) 2015-2023 Plasma Team
+    Copyright (C) 2015-2025 Plasma Team
     Distributed under the terms of the MIT License see LICENSE.code
 
     The `git log` indicates the members of Plasma Team

README.md

@@ -10,7 +10,7 @@ For a general overview, please visit
 [https://plasmalang.org/](https://plasmalang.org/)
 It is in early development.
 
-It is free software, Copyright (C) 2015-2023 The Plasma Team, distributed
+It is free software, Copyright (C) 2015-2025 The Plasma Team, distributed
 mostly under the MIT license, see [LICENSE](LICENSE) for details.
 
 ![CI](https://github.com/PlasmaLang/plasma/workflows/CI/badge.svg)

runtime/pz_main.cpp

@@ -160,6 +160,6 @@ static void version(void)
 {
     printf("Plasma Runtime, " PLASMA_VERSION_STRING "\n");
     printf("https://plasmalang.org\n");
-    printf("Copyright (C) 2015-2023 The Plasma Team\n");
+    printf("Copyright (C) 2015-2025 The Plasma Team\n");
     printf("Distributed under the MIT License\n");
 }

src/constant.m

@@ -87,7 +87,7 @@
 version(Name, !IO) :-
     io.format("%s, %s\n", [s(Name), s(version_string)], !IO),
     io.write_string("https://plasmalang.org\n", !IO),
-    io.write_string("Copyright (C) 2015-2023 The Plasma Team\n", !IO),
+    io.write_string("Copyright (C) 2015-2025 The Plasma Team\n", !IO),
     io.write_string("Distributed under the MIT License\n", !IO).
 
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