update test coverage

Author: GiggleLiu

.github/workflows/CI.yml

@@ -53,21 +53,17 @@ jobs:
             ${{ runner.os }}-
       - uses: julia-actions/julia-buildpkg@v1
       - uses: julia-actions/julia-runtest@v1
-      - uses: julia-actions/julia-processcoverage@v1
-      - uses: codecov/codecov-action@v1
-        with:
-          file: lcov.info
 
   finish:
       needs: [pre_job, test]
       if: ${{ needs.pre_job.outputs.should_skip != 'true' }}
-      name: Coveralls Finished
+      name: Code coverage
       runs-on: ubuntu-latest
       steps:
-        - uses: coverallsapp/github-action@master
+        - uses: julia-actions/julia-processcoverage@v1
+        - uses: codecov/codecov-action@v1
           with:
-            github-token: ${{ secrets.GITHUB_TOKEN }}
-            parallel-finished: true
+            file: lcov.info
 
   docs:
     name: Documentation

README.md

@@ -1,7 +1,7 @@
 # GenericTensorNetworks
 
 [![Build Status](https://github.com/QuEraComputing/GenericTensorNetworks.jl/workflows/CI/badge.svg)](https://github.com/QuEraComputing/GenericTensorNetworks.jl/actions)
-[![Coverage Status](https://coveralls.io/repos/github/QuEraComputing/GenericTensorNetworks.jl/badge.svg?branch=master&t=rIJIK2)](https://coveralls.io/github/QuEraComputing/GenericTensorNetworks.jl?branch=master)
+[![codecov](https://codecov.io/gh/QuEraComputing/GenericTensorNetworks.jl/branch/main/graph/badge.svg?token=vwWQntOxvG)](https://codecov.io/gh/QuEraComputing/GenericTensorNetworks.jl)
 [![Docs](https://img.shields.io/badge/docs-dev-blue.svg)](https://queracomputing.github.io/GenericTensorNetworks.jl/dev/)
 
 ## Installation