Merge pull request #145 from viralpraxis/drop-redundant-execjs-runtime-attr-reader

Drop obsolete `ExecJS.runtime` attr_reader

Author: byroot

lib/execjs/module.rb

@@ -8,8 +8,6 @@ class ProgramError              < Error; end
   class RuntimeUnavailable < RuntimeError; end
 
   class << self
-    attr_reader :runtime
-
     def runtime=(runtime)
       raise RuntimeUnavailable, "#{runtime.name} is unavailable on this system" unless runtime.available?
       @runtime = runtime