ci(appveyor): Fix gem dependency for test

kozo2 · web-flow · commit b176125ee62f · 2019-01-12T01:50:23.000+09:00
diff --git a/appveyor.yml b/appveyor.yml
@@ -11,6 +11,7 @@ before_test:
   - gem -v
   - bundle -v
   - rubydown --version
+  - gem install bio
 
 test_script:
   - choco install gnuplot
