README.md in dry-schema-0.2.0 vs README.md in dry-schema-0.3.0

- old
+ new
@@ -10,12 +10,21 @@
 [![Build Status](https://travis-ci.org/dry-rb/dry-schema.svg?branch=master)][travis]
 [![Code Climate](https://codeclimate.com/github/dry-rb/dry-schema/badges/gpa.svg)][codeclimate]
 [![Test Coverage](https://codeclimate.com/github/dry-rb/dry-schema/badges/coverage.svg)][codeclimate]
 [![Inline docs](http://inch-ci.org/github/dry-rb/dry-schema.svg?branch=master)][inchpages]
 
-<!-- ## Links
+## Links
 
-* [Documentation](http://dry-rb.org/gems/dry-schema) -->
+* [Documentation](http://dry-rb.org/gems/dry-schema)
+
+## Supported Ruby versions
+
+This library officially supports following Ruby versions:
+
+* MRI >= `2.4`
+* jruby >= `9.2`
+
+It **should** work on MRI `2.3.x` too, but there's no official support for this version.
 
 ## License
 
 See `LICENSE` file.