electrostatics - Why is electric field lines away from (+) and toward (-)?

I have a questions about the electric field lines.

Well in the basic learning, we know that:

1. The electric field lines extend away from a positive charge


2. They move forward a negative charge

Let's take parallel plates, which make a uniform electric field.If we take the basic learning, which I mentioned, in accounts, it's very easy to understand that this is the direction of a positive charge object if we put the object between the plate (move away the positive charged plate and toward negatively charged plate).

The problem is if we put a negative charged object between. Isn't the electric field reversed ?