added build and codecov badge

README.md

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 # Overseer (Entity Component System)
-[![Build Status](https://travis-ci.org/louisponet/Overseer.jl.svg?branch=master)](https://travis-ci.org/louisponet/Overseer.jl)
-[![Coverage Status](https://coveralls.io/repos/github/louisponet/Overseer.jl/badge.svg?branch=master)](https://coveralls.io/github/louisponet/Overseer.jl?branch=master)
+[![Build Status](https://github.com/louisponet/Overseer.jl/workflows/CI/badge.svg)](https://github.com/louisponet/Overseer.jl/actions?query=workflow%3ACI)
+[![codecov](https://codecov.io/gh/louisponet/Overseer.jl/branch/master/graph/badge.svg?token=mVK0aEQGuu)](https://codecov.io/gh/louisponet/Overseer.jl)
 
 This package supplies a lightweight, performant and friction-free implementation of the [Entity component system](https://en.wikipedia.org/wiki/Entity_component_system)(ECS) paradigm. It has been used mostly in game development, however I think that it's concept, way of programming and thinking can be applied and used in more broad applications. It offers a very clean and flexible way to gradually build up an application in well separated blocks, while remaining very performant due to the way data is generally structured and used.