- upgrade dependencies

- fixes #52
- fixes maxLength -> maxItems for array of tags in a token and add unit test
- switch from npm to yarn

.github/workflows/tests.yaml

@@ -10,13 +10,13 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        node: [ '10', '12' ]
+        node: [ '10', '12', '14' ]
     name: Node ${{ matrix.node }}
     steps:
       - uses: actions/checkout@v2
       - name: Setup node
         uses: actions/setup-node@v1
         with:
           node-version: ${{ matrix.node }}
-      - run: npm install
+      - run: yarn install
       - run: npm test

DEVELOPMENT.md

@@ -2,22 +2,23 @@
 
 Below is a list of commands you will probably find useful.
 
-## `npm start`
+## `yarn start`
 
-Runs the project in development/watch mode. Your project will be rebuilt upon changes. TSDX has a special logger for you convenience. Error messages are pretty printed and formatted for compatibility VS Code's Problems tab.
+Runs the project in development/watch mode. Your project will be rebuilt upon changes. 
+TSDX has a special logger for you convenience. Error messages are pretty printed and formatted for compatibility VS Code's Problems tab.
 
 <img src="https://user-images.githubusercontent.com/4060187/52168303-574d3a00-26f6-11e9-9f3b-71dbec9ebfcb.gif" width="600" />
 
 Your library will be rebuilt if you make edits.
 
-## `npm run build`
+## `yarn build`
 
 Bundles the package to the `dist` folder.
 The package is optimized and bundled with Rollup into multiple formats (CommonJS, UMD, and ES Module).
 
 <img src="https://user-images.githubusercontent.com/4060187/52168322-a98e5b00-26f6-11e9-8cf6-222d716b75ef.gif" width="600" />
 
-## `npm test`
+## `yarn test`
 
 Runs the test watcher (Jest) in an interactive mode.
 By default, runs tests related to files changed since the last commit.