Fixes github CI for automated testing

See this for details: https://github.blog/changelog/2020-10-01-github-actions-deprecating-set-env-and-add-path-commands/

Author: Jay Herron

.github/workflows/build.yml

@@ -17,7 +17,7 @@ jobs:
     steps:
     - uses: actions/checkout@v2
     - name: Set code coverage path 
-      run: echo ::set-env name=codecov_path::$(swift test --show-codecov-path)
+      run: echo "codecov_path=$(swift test --show-codecov-path)" >> $GITHUB_ENV
     - name: Test and publish code coverage to Code Climate
       uses: paulofaria/codeclimate-action@master
       if: matrix.os == 'macos-10.15'