Releasing version 20.03.0

Bump version to 2.1.0 (dgraph-io#127)

Update publishing instructions. (dgraph-io#120)

Upgrade version to 2.0.1

Upgrade version to 2.0.0

Moving the dependency io.opencensus.* into a test dependency only, (d…

…graph-io#89)

to avoid excessive CPU usage reported in
census-instrumentation/opencensus-java#1599

Bump up the version to 1.7.4 (best effort flag for the Transaction)

Updating the version to 1.7.3 in docs

Version bump to 1.7.0.

Remove LinRead map and sequencing