Update README.md examples to reflect new version 0.1.1

Author: ponylang-main

README.md

@@ -13,7 +13,7 @@ Please note that if this library encounters a state that the programmers thought
 ## Installation
 
 * Install [corral](https://github.com/ponylang/corral)
-* `corral add github.com/ponylang/postgres.git --version 0.1.0`
+* `corral add github.com/ponylang/postgres.git --version 0.1.1`
 * `corral fetch` to fetch your dependencies
 * `use "postgres"` to include this package
 * `corral run -- ponyc` to compile your application