fix: browserifed not bundled in release

chore(ci): fix release

Merge pull request #7 from adorsys/edge-compatibility

feat(*): Add edge compatibility

fix: added credits to saucelabs

refactor: update dependency of abstract-leveldown

refactor: update dependency of abstract-leveldown

BREAKING CHANGE: null and undefined are not supported as values anymore

feat: BREAKING CHANGE: API needs a JSON Web Key instead of Codec

fix: added npmignore

fix: bug with identity codec