use AR-JDBC (>=) 1.3.0 with AR 4.0

version 1.2.x ain't really compatible with **4.0**
it's probably also a good idea to use 1.3.0 on the *"3-x-stable"* branches ... 
since it should provide better compatibility with AR 3.x than 1.2.x did

p.s. some related discussion: https://github.com/rails/rails/issues/11595