Add CHANGELOG.md and commit package-lock.json

Author: NicolasCARPi

CHANGELOG.md

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+# Changelog for apidoc-core
+
+## Unreleased
+
+### Added
+
+* Allow the use of | to specify different types: {String|Number} (#62)
+* Allow the use of $ in the param name (#36)
+* Allow special characters in name and group
+
+### Changed
+
+* Update dependencies
+* Use os.EOL instead of own logic for line endings
+
+### Fixed
+
+* Update elixir's syntax (#65)