README.md in sinclair-1.2.0 vs README.md in sinclair-1.2.1

@@ -10,11 +10,11 @@
 
 This gem helps the creation of complex concern with class methods
 
 Yard Documentation
 -------------------
-https://www.rubydoc.info/gems/sinclair/1.2.0
+https://www.rubydoc.info/gems/sinclair/1.2.1
 
 Installation
 ---------------
   - Install it
 
@@ -246,5 +246,11 @@
       should add method 'the_method' to #<Class:0x0000000146c160> instances
   when the builder runs
       should add method 'the_method' to #<Class:0x0000000143a1b0> instances
 
 ```
+
+Projects Using
+---------------
+
+- [Arstotzka](https://github.com/darthjee/arstotzka)
+