Bundling Improvements

Improvements

• Add ES modules support, which allows for tree shaking.
• CommonJS support is still included.
• The module minzipped size is now down to 1.4 KB.
• Reached code quality A+ on Codefactor.
• Achieved 100% code coverage.
• More suitable for browsers usage.

Breaking changes

• Removed loadAndExtractMarksFromDocument, because it's causing the pdfjs-dist dependency, and not suitable for the browser.
• Users should now import pdfjs-dist on and load the document on their own.

Miscellaneous

• Remove pdfjs-dist from the dependencies, and make it a dev dependency instead.
• Updated the examples in README.md to include how to load the documents using pdfjs-dist.
• Added Jest for unit testing, the module is now tested with 100% coverage as reported by Codecov.
• Added eslint for linting the source code.