Bug fixes, package updates

Package updates + bug fixes by @niekcandaele and @vira-khdr.

Fix issue with protobuf batch preparation

Thanks to @davidsierradz for pointing the bug out and providing a patch: #64

Add timeout option to batching to prevent hoarding of memory

Thanks to @johakr for the contribution! As there seems to be less bugs reported as of late, I decided that this could be the first proper v6.0.0 release.

Fix protobuf timestamps

Fixes a bug with Protobuf use where millisecond timestamps like the one created by Date.now() got translated to microseconds instead of nanoseconds like defined in the Loki Protobuf API. Thanks @teolag!

Send logs as an UTF8 buffer

Thanks to @jasyes for pointing this bug out! 200 commits strong 👍

Fix shutdown behavior

Added fix from #51 which makes sure the batcher loop closes correctly on exit.

Hotfix to circuit breaker

Related to issue #48

Remove debug console logs, fix bug with batching delay

Adds fixes to issues pointed out by @apmorton: #47, #48

Add type definitions for options

Merge pull request #46 from mpetrunic/mpetrunic/types

Add typescript type definition

6.0.0 Release candidate 3

Includes a fix to the basic auth functionality. Thanks to @yaron-idan for pointing it out and fixing the issue. :)