remove useless reference to rxdart

[jeremylandon]

Actual Behavior

When you use RXdart 0.23, the import of frideos_light is impossible because this package depend of rxdart 0.22.0

Issue

Because frideos_light >=0.5.0 depends on rxdart ^0.22.0 and **** depends on rxdart ^0.23.1, frideos_light >=0.5.0 is forbidden.
So, because **** depends on frideos_light 0.5.0, version solving failed.

Steps to Reproduce the Problem

1. import rxdart 0.23.x
2. import frideos_light 0.5.0

Proposed Changes

• remove reference of rxdart in frideos_light who is useless for this package (it's use by the frideos_core dependency)
• upgrade version of frideos_core (0.5.0 -> 0.6.0)

[frideosapps]

Hello @Golapadeog, thank for the PR. Unfortunately this package was discontinued. I've just updated the frideos package to the version 1.0.0. The frideos core package was integrated in this one, and the shared preferences dependency removed, so it basically is the same as the frideos light but with some new features and improvements.

https://github.com/frideosapps/frideos_flutter