docs: added postgres keyword

Author: mhweiner

README.md

@@ -9,7 +9,7 @@
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-**pgsmith** is a utility for safely building parameterized SQL queries for use with [`pg`](https://github.com/brianc/node-postgres).
+**pgsmith** is a utility for safely building parameterized SQL queries for use with Postgres and [`pg`](https://github.com/brianc/node-postgres).
 
 This is **not** an ORM or DSL. It’s a simple, composable SQL builder that lets you write SQL the way you want — clearly and safely.