update

Author: kaznak

README.md

@@ -5,7 +5,7 @@ A Collection of Postgres Extensions.
 Many valuable Postgres Extensions are not available as packages in the official repositories.
 This repository contains a collection of packages for Postgres Extensions I curated.
 
-## Build Environment
+## Build Environments
 
 Docker images for build environmet are builded and stored at [kaznak/container-images](https://github.com/kaznak/container-images).