message: Update ci.yml to no longer use set-env
diff: @@ -17,7 +17,7 @@ jobs:
  submodules: recursive
  - name: Set CURRENT_TWO_WEEKS for use in cache keys
  - run: echo "::set-env name=CURRENT_TWO_WEEKS::$(($(date +%-V) / 2))"
  + run: echo "CURRENT_TWO_WEEKS=$(($(date +%-V) / 2))" >> $GITHUB_ENV
  - name: Cache Cargo
  uses: actions/cache@v1
  