fix: Update platforms in Gemfile for Windows

Author: cgoldberg

Gemfile

@@ -6,9 +6,9 @@ gemspec
 
 gem "html-proofer", "~> 5.0", group: :test
 
-platforms :mingw, :x64_mingw, :mswin, :jruby do
+platforms :windows, :jruby do
   gem "tzinfo", ">= 1", "< 3"
   gem "tzinfo-data"
 end
 
-gem "wdm", "~> 0.2.0", :platforms => [:mingw, :x64_mingw, :mswin]
+gem "wdm", "~> 0.2.0", :platforms => [:windows]