simplified CI, removed coveralls

.github/workflows/ci.yml

@@ -44,26 +44,4 @@ jobs:
       - uses: julia-actions/julia-buildpkg@v1
       - uses: julia-actions/julia-runtest@v1
       - uses: julia-actions/julia-processcoverage@v1
-      - uses: codecov/codecov-action@v3
-        with:
-          file: ./lcov.info
-          flags: unittests
-          name: codecov-umbrella
-          fail_ci_if_error: false
-          token: ${{ secrets.CODECOV_TOKEN }}
-      - uses: coverallsapp/github-action@master
-        with:
-          github-token: ${{ secrets.GITHUB_TOKEN }}
-          flag-name: run-${{ matrix.version }}-${{ matrix.os }}-${{ matrix.arch }}-${{ matrix.trixi_test }}
-          parallel: true
-          path-to-lcov: ./lcov.info
-
-  finish:
-    needs: test
-    runs-on: ubuntu-latest
-    steps:
-      - name: Coveralls Finished
-        uses: coverallsapp/github-action@master
-        with:
-          github-token: ${{ secrets.GITHUB_TOKEN }}
-          parallel-finished: true
+      - uses: codecov/codecov-action@v4

README.md

@@ -9,7 +9,6 @@
 [![Docs](https://img.shields.io/badge/docs-stable-blue.svg)](https://CTUAvastLab.github.io/Mill.jl/stable)
 [![Docs](https://img.shields.io/badge/docs-dev-blue.svg)](https://CTUAvastLab.github.io/Mill.jl/dev)
 [![Build Status](https://github.com/CTUAvastLab/Mill.jl/workflows/CI/badge.svg)](https://github.com/CTUAvastLab/Mill.jl/actions?query=workflow%3ACI)
-[![Coverage Status](https://coveralls.io/repos/github/CTUAvastLab/Mill.jl/badge.svg?branch=master)](https://coveralls.io/github/CTUAvastLab/Mill.jl?branch=master)
 [![codecov.io](http://codecov.io/github/CTUAvastLab/Mill.jl/coverage.svg?branch=master)](http://codecov.io/github/CTUAvastLab/Mill.jl?branch=master)
 
 `Mill.jl` (Multiple Instance Learning Library) is a library aimed to prototype flexible hierarchical multi-instance learning models built on top of [`Flux.jl`](https://fluxml.ai). It is developed to be: