feat: update chokidar to v3

BREAKING CHANGE:

Massive CPU & RAM consumption improvements. 17x package & deps size reduction.

Author: radum

.travis.yml

@@ -5,11 +5,10 @@ cache:
 notifications:
   email: false
 node_js:
+  - '12'
   - '11'
   - '10'
   - '8'
-  - '6'
-  - '4'
 before_install:
   - if [ "$TRAVIS_PULL_REQUEST_BRANCH" == "" ]; then echo "//registry.npmjs.org/:_authToken=\${NPM_TOKEN}" >> .npmrc; fi
 after_success: