Switched to numo-narray-alt

Author: ankane

Gemfile

@@ -5,7 +5,7 @@ gemspec
 gem "rake"
 gem "minitest"
 gem "matrix"
-gem "numo-narray", platform: [:mri, :windows]
+gem "numo-narray-alt", platform: [:mri, :windows]
 gem "rover-df", platform: [:mri, :windows]
 gem "csv"
 gem "ruby_memcheck"