.simplecov: require English with capital E

On case-sensitive filesystems, require "english" will fail with "cannot load such file -- english"

Library/Homebrew/.simplecov

 #!/usr/bin/env ruby
 
-require "english"
+require "English"
 
 SimpleCov.start do
   coverage_dir File.expand_path("../test/coverage", File.realpath(__FILE__))