Merge pull request brianc#942 from koistya/patch-1

Add pg-client to the list of extras in README.md

Author: brianc

README.md

@@ -147,6 +147,7 @@ node-postgres is by design pretty light on abstractions.  These are some handy m
 - [iceddev/pg-transact](https://github.com/iceddev/pg-transact) - A nicer API on node-postgres transactions
 - [sehrope/node-pg-db](https://github.com/sehrope/node-pg-db) - Simpler interface, named parameter support, transaction management and event hooks.
 - [vitaly-t/pg-promise](https://github.com/vitaly-t/pg-promise) - Use node-postgres via [Promises/A+](https://promisesaplus.com/).
+- [kriasoft/node-pg-client](https://github.com/kriasoft/node-pg-client) - Promise-based wrapper for `node-postgres` designed for easy use with ES7 async/await.
 - [pg-then](https://github.com/coderhaoxin/pg-then) A tiny wrapper of `pg` for promise api.
 - [pg-rxjs](https://github.com/jadbox/pg-rxjs) Another tiny wrapper like `pg-then` but for [RxJS](https://github.com/Reactive-Extensions/RxJS)
 - [acarl/pg-restify](https://github.com/acarl/pg-restify) - Creates a generic REST API for a postgres database using restify.