Mention SQLite issue

Author: MaxLap

README.md

@@ -54,6 +54,18 @@ Or install it yourself with:
 
     $ gem install activerecord_where_assoc
 
+## Sqlite issue
+
+If used with SQLite, not that there is a problem related to nested EXISTS in SQLite 3.51.0 (contained in the [sqlite3 gem version 2.8.0](https://rubygems.org/gems/sqlite3/versions/2.8.0)). It is recommended to avoid the problematic version with:
+
+```ruby
+gem 'sqlite3', '!= 2.8.0'
+
+# Of you want another version pattern, you can have multiple ones.
+# The chosen version must match all conditions. ex:
+gem 'sqlite3', '>= 2.2.0', '!= 2.8.0'
+```
+
 ## Development state
 
 This gem is feature complete and production ready.<br>