Notes on performance tests in the README

Notes on performance tests in the README
From 010c66bddddde368d09c1294a0001ca75f5993eb Mon Sep 17 00:00:00 2001
From: Ben Langfeld <blangfeld@powerhrg.com>
Date: Thu, 6 Dec 2018 10:51:31 -0200
Subject: [PATCH] Notes on performance tests in the README


diff --git a/README.md b/README.md
index b45afcf..2fef9ca 100644
--- a/README.md
+++ b/README.md
@@ -581,3 +581,7 @@ We include a Docker Compose configuration to run test suite in isolation, or if
 Run `rake yard` (or `docker-compose run docs rake yard`) in order to generate the implementation's API docs in HTML format, and `open doc/index.html` to view them.
 
 While working on documentation, it is useful to automatically re-build it as you make changes. You can do `yard server --reload` (or `docker-compose up docs`) and `open http://localhost:8808` to browse live-built docs as you edit them.
+
+### Benchmarks
+
+Some simple benchmarks are implemented in `spec/performance` and can be executed using `rake performance` (or `docker-compose run tests rake performance`). You should run these before and after your changes to avoid introducing performance regressions.

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