Testing.

This is a test PR; do not merge.

I'm trying to determine whether #262 is failing due to the PR itself
or due to something else changing. This commit adds an inert change
to README.md.

README.md

@@ -1,5 +1,7 @@
 # WASI SDK
 
+This is a test!
+
 ## Quick Start
 
 [Download SDK packages here.](https://github.com/WebAssembly/wasi-sdk/releases)