v0.4.0

Added:

• Upgraded grpcio to version 0.5
• openssl and openssl-vendored passthrough features to grpcio are now available
• Support for Dgraph 20.03
• JWT support

Fixed:

• query and query_with_vars now accept more standard &str as the query argument (previously Into<String>).

Removed:

• [BREAKING] Dropped support for Dgraph 1.0. dgraph-1-0 and dgraph-1-1 are now removed as well which simplifies the installation.