Upgrade to db_connection 2

[lewisf]

As stated, elixir-ecto/db_connection#167

[ospaarmann]

I will have a look into it and upgrade.

[ospaarmann]

@lewisf This will be part of Version 0.3.0 that I am working on and hope to release within the next 2 weeks.

WIP here: https://github.com/ospaarmann/exdgraph/tree/update_to_db_connection_2

[mingfang]

@ospaarmann what is the status of the v0.3.0 release?

[leland-rasmussen]

@ospaarmann Also interested in the v0.3.0 release.

@ospaarmann what is the status of the v0.3.0 release?