chore: follow defaults for `semantic-release`

Signed-off-by: Jon Koops <[email protected]>

ci: add releaserc file

fix: use specific semantic-release version

docs: fix acceptedFiles arg type

fix: make MIME type check case-insensitive

fix: fix es module compatibility and close #48

feat: Add a module entry to package.json (#47)

feat: add TypeScript type definitions (#40)

ci: ditch travis in favor of github actions

fix: drop a RegExp in favour of an .endsWith (#27)