Update courier to 0.4.0

Author: SeanTAllen

README.md

@@ -11,7 +11,7 @@ Additional API surface and functionality will be added as needed. If you need fu
 
 ## Installation
 
-* Requires ponyc 0.65.0 or later
+* Requires ponyc 0.65.0 or later. On Windows, requires ponyc 0.66.0 or later.
 * Install [corral](https://github.com/ponylang/corral)
 * `corral add github.com/ponylang/github_rest_api.git --version 0.6.0`
 * `corral fetch` to fetch your dependencies

corral.json

@@ -10,7 +10,7 @@
     },
     {
       "locator": "github.com/ponylang/courier.git",
-      "version": "0.3.1"
+      "version": "0.4.0"
     },
     {
       "locator": "github.com/ponylang/uri.git",