use native nodejs test & assert modules

Refactors

• update tests (da00c2ad)

Chores

• readme: update and fix typos and grammar (19e0dbb7)
• package: update package within dependencies (2a825757)

Continuous Integration

• action: use latest stable nodejs (bf570a7a)
• action: update node matrix (a6ca46f3)

Full Changelog: f7485d8...a6ca46f

Following to the PR: #18

v1.2.1

Merge pull request #6 from yukal/dependabot/npm_and_yarn/gulp-load-pl…