chore:fix publish script (#15)

Author: joscha

.github/workflows/node.js.yml

@@ -15,7 +15,7 @@ jobs:
 
     strategy:
       matrix:
-        node-version: [12.x, 14.x]
+        node-version: [12.x, 14.x, 16.x]
         # See supported Node.js release schedule at https://nodejs.org/en/about/releases/
 
     steps:
@@ -26,3 +26,5 @@ jobs:
           node-version: ${{ matrix.node-version }}
       - run: yarn install --frozen-lockfile
       - run: yarn test
+      - run: npm install
+      - run: npm pack

.gitignore

@@ -3,4 +3,5 @@
 /dist
 yarn-error.log
 /canva-public-dependency-tree-*.tgz
+/canva-dependency-tree-*.tgz
 .DS_Store