While keeping the API unchanged for the package consumers, the following changes are introduced:

• rewrite the whole codebase in TypeScipt
• use Jest with TS (instead of mocha+should+nyc)
• configure eslint+prettier + TS parser
• update travis.yml to use defaults and node 12
• apply strict typing: tsconfig.noImplicitAny: true
• write benchmarking shell script (./bench/_bench.sh)
• update benchmark results (in README)
• check solvable issues => solved \r breaks line, but it should not #22 and wrote test for it
• ensure all pre-written tests are passing
• ensure the success of yarn build, generated dist/ and npm pack/publish
• add .vscode/launch.json ready-config for debugging tests
• configure easily-accessible scripts: yarn build, yarn lint, yarn test, yarn bench

Noticed possible further improvements… for later

• change the API so that functions accept options: object, instead of multi-signature/overriding functions (major release, breaking change)
• fix the opposite case of issue \r breaks line, but it should not #22 stringify(parse(STRING_OF_ISSUE22)). A test for it is already added in this PR and skipped