Update sampo grafiikka URL

.github/FUNDING.yml

@@ -1 +0,0 @@
-ko_fi: kojix2

.github/workflows/ci.yml

@@ -1,5 +1,5 @@
 name: test
-on: [push, pull_request]
+on: [push, pull_request, workflow_dispatch]
 jobs:
   build:
     name: ${{ matrix.os }} Ruby ${{ matrix.ruby }}
@@ -7,7 +7,7 @@ jobs:
     strategy:
       matrix:
         os: ["ubuntu", "macos"]
-        ruby: ["2.6", "2.7", "3.0", "3.1", "3.2", "3.3", "3.4"]
+        ruby: ["2.6", "2.7", "3.0", "3.1", "3.2", "3.3", "3.4", "head"]
     steps:
       - uses: actions/checkout@v4
       - uses: ruby/setup-ruby@v1

LICENSE.txt

@@ -1,6 +1,7 @@
 The MIT License (MIT)
 
 Copyright (c) 2020 kojix2
+Copyright (c) 2025 Red Data Tools
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal

README.md

@@ -311,7 +311,7 @@ bundle exec exe/uplot      # Run youplot (Try out the edited code)
 
 ### Acknowledgements
 
-* [sampo grafiikka](https://jypg.net/sampo_grafiikka) - Project logo creation
+* [sampo grafiikka](https://lepo.sampo-grafiikka.com/) - Project logo creation
 * [yutaas](https://github.com/yutaas) - English proofreading
 
 ## License