README.md in osqp-0.2.1 vs README.md in osqp-0.2.2

- old
+ new

@@ -1,8 +1,10 @@
 # OSQP Ruby
 
 The [OSQP](https://osqp.org/) (Operator Splitting Quadratic Program) solver for Ruby
 
+Check out [Opt](https://github.com/ankane/opt) for a high-level interface
+
 [![Build Status](https://github.com/ankane/osqp-ruby/workflows/build/badge.svg?branch=master)](https://github.com/ankane/osqp-ruby/actions)
 
 ## Installation
 
 Add this line to your application’s Gemfile: