Update README.md

Author: Antoine Kevin

README.md

@@ -22,7 +22,7 @@ This version of the gem is compatible with `Ruby 2.1` and above.
 
 Using bundler:
 
-    gem 'intercom', "~> 3.5.1"
+    gem 'intercom', "~> 3.5.2"
 
 ## Basic Usage