Fixed the wrong test library with minitest

hsbt · hsbt · commit db469279aead · 2020-07-16T21:28:33.000+09:00
diff --git a/.gitignore b/.gitignore
@@ -6,3 +6,4 @@
 /pkg/
 /spec/reports/
 /tmp/
+Gemfile.lock
diff --git a/Gemfile b/Gemfile
@@ -4,4 +4,4 @@ gemspec
 
 gem "bundler"
 gem "rake"
-gem "minitest"
+gem "test-unit"
