tab: include HOMEBREW_VERSION

Library/Homebrew/tab.rb

@@ -20,6 +20,7 @@ class Tab < OpenStruct
   def self.create(formula, compiler, stdlib)
     build = formula.build
     attributes = {
+      "homebrew_version" => HOMEBREW_VERSION,
       "used_options" => build.used_options.as_flags,
       "unused_options" => build.unused_options.as_flags,
       "tabfile" => formula.prefix.join(FILENAME),
@@ -299,6 +300,7 @@ class Tab < OpenStruct
 
   def to_json
     attributes = {
+      "homebrew_version" => homebrew_version,
       "used_options" => used_options.as_flags,
       "unused_options" => unused_options.as_flags,
       "built_as_bottle" => built_as_bottle,
@@ -317,6 +319,9 @@ class Tab < OpenStruct
   end
 
   def write
+    require 'pry-byebug'
+    binding.pry
+
     # If this is a new installation, the cache of installed formulae
     # will no longer be valid.
     Formula.clear_installed_formulae_cache unless tabfile.exist?