README fix.

mcollina · mcollina · commit f8b3183d966b · 2016-08-05T19:30:50.000+02:00
diff --git a/README.md b/README.md
@@ -50,6 +50,7 @@ Supported types:
  * `'number'`
  * `'array'`
  * `'object'`
+ * `'boolean'`
  * `'null'`
 
 And nested ones, too.
