Update html_spec.rb

added razor files to html spec

Author: Inspirateur

spec/lexers/html_spec.rb

@@ -66,6 +66,7 @@
       assert_guess :filename => 'foo.htm'
       assert_guess :filename => 'foo.xhtml'
       assert_guess :filename => 'foo.cshtml'
+      assert_guess :filename => 'foo.razor'
     end
 
     it 'guesses by mimetype' do