def needs_update?
      return true unless File.exist?(@context.xcconfig_path)
      xcconfig_hash = Xcodeproj::Config.new(File.new(@context.xcconfig_path)).to_hash
      needs_update = xcconfig_hash[MANGLED_SPECS_CHECKSUM_XCCONFIG_KEY] != @context.specs_checksum
      Pod::UI.message '- Mangling config already up to date' unless needs_update
      needs_update
    end
def needs_update?
      return true unless File.exist?(@context.xcconfig_path)
      xcconfig_hash = Xcodeproj::Config.new(File.new(@context.xcconfig_path)).to_hash
      needs_update = xcconfig_hash[MANGLED_SPECS_CHECKSUM_XCCONFIG_KEY] != @context.specs_checksum
      Pod::UI.message '- Mangling config already up to date' unless needs_update
      needs_update
    end
Does the mangling xcconfig need to be updated?
 @return  [Truthy] Does the xcconfig need to be updated?