UPdate gitignore to ignore Unity3d Library directory
UPdate gitignore to ignore Unity3d Library directory

lacostej/jenkins-unity3d-plugin,jenkinsci/unity3d-plugin,sq5gvm/unity3d-plugin,sq5gvm/unity3d-plugin,sq5gvm/unity3d-plugin,jenkinsci/unity3d-plugin,lacostej/jenkins-unity3d-plugin,jenkinsci/unity3d-plugin,lacostej/jenkins-unity3d-plugin