update README.md with spelling fix
@@ -269,7 +269,7 @@ import (
Occasionally service-side changes require major changes to existing versions.
These cases are noted in the changelog.
-All avilable services and versions are listed under the `services/` path in
+All available services and versions are listed under the `services/` path in
this repo and in [GoDoc][services_godoc]. Run `find ./services -type d
-mindepth 3` to list all available service packages.
