add node-chakracore to CI testing

Author: alexlamsl

.github/workflows/ci.yml

@@ -5,7 +5,7 @@ jobs:
     strategy:
       matrix:
         os: [ ubuntu-latest, windows-latest ]
-        node: [ "0.10", 0.12, 4, 6, 8, 10, latest ]
+        node: [ "0.10", 0.12, 4, 6, 8, 10, latest, chakracore ]
         script: [ compress, mocha, release/benchmark, release/jetstream ]
     name: ${{ matrix.os }} ${{ matrix.node }} ${{ matrix.script }}
     runs-on: ${{ matrix.os }}