Update command to run locally in website README.

website/README.md

@@ -17,7 +17,7 @@ commands:
 
 ```
 $ bundle
-$ bundle exec middleman server
+$ PACKER_DISABLE_DOWNLOAD_FETCH=true PACKER_VERSION=1.0 bundle exec middleman server
 ```
 
 Then open up `localhost:4567`. Note that some URLs you may need to append

website/config.rb

 require "net/http"
 
-raise "BINTRAY_API_KEY must be set." if !ENV["BINTRAY_API_KEY"]
 raise "PACKER_VERSION must be set." if !ENV["PACKER_VERSION"]
 
 #-------------------------------------------------------------------------
@@ -11,6 +10,7 @@ $packer_files = {}
 $packer_os = []
 
 if !ENV["PACKER_DISABLE_DOWNLOAD_FETCH"]
+  raise "BINTRAY_API_KEY must be set." if !ENV["BINTRAY_API_KEY"]
   http = Net::HTTP.new("dl.bintray.com", 80)
   req = Net::HTTP::Get.new("/mitchellh/packer")
   req.basic_auth "mitchellh", ENV["BINTRAY_API_KEY"]