Bumping version (#355)

Author: choran

README.md

@@ -22,7 +22,7 @@ This version of the gem is compatible with `Ruby 2.1` and above.
 
 Using bundler:
 
-    gem 'intercom', '~> 3.5.10'
+    gem 'intercom', '~> 3.5.18'
 
 ## Basic Usage