Update modules and dependencies, change to jsbi

* Drop gulp support
* Migrate long.js to JSBI library (for long math)
* Update karma targets

.travis.yml

@@ -2,7 +2,7 @@ sudo: false
 dist: trusty
 language: node_js
 node_js:
-- '8'
+- '14'
 env:
   matrix:
   - SAUCE=true
@@ -18,7 +18,7 @@ script:
 - npm run browser-test
 - npm run lint
 after_sucess:
-- ci/coveralls.sh
+- npm run send-coverage
 git:
   depth: 1
   submodules: false