remove @since tags for 2.0.0

lib/rscons/builders/command.rb

@@ -3,8 +3,6 @@ module Rscons
     # A builder to execute an arbitrary command that will produce the given
     # target based on the given sources.
     #
-    # @since 1.8.0
-    #
     # Example:
     #   env.Command("docs.html", "docs.md",
     #               CMD => %w[pandoc -fmarkdown -thtml -o${_TARGET} ${_SOURCES}])

lib/rscons/builders/simple_builder.rb

@@ -1,8 +1,6 @@
 module Rscons
   module Builders
     # A Generic builder which has its operation is defined at instantiation.
-    #
-    # @since 1.8.0
     class SimpleBuilder < Builder
 
       # @return [String]