Raise early if unexpected HTTP response

If the page 500s or 400s, this would be a clearer error.

Author: zetter-rpf

lib/scratch_config_importer.rb

@@ -13,12 +13,18 @@ def initialize(asset_config_url, asset_base_url)
   end
 
   def import
-    config = Faraday.get(asset_config_url).body
+    config = connection.get.body
     asset_config = JSON.parse(config, symbolize_names: true)
     asset_names = extract_asset_names(asset_config)
     ScratchAssetImporter.import(asset_names, asset_base_url)
   end
 
+  def connection
+    Faraday.new(url: asset_config_url) do |faraday|
+      faraday.response :raise_error
+    end
+  end
+
   private
 
   def extract_asset_names(config)