DB_TYPE missing in Readme

When I tried to connect to an External MySQL Server as described in the readme I wasn't successful. The container started always with the embedded H2-Database because in the manual (readme) a paramter is missing in the command. The DB_TYPE has to be part of the docker run command:

docker run --name=activiti -d -e 'DB_TYPE=mysql' -e 'DB_HOST=192.0.2.1' -e 'DB_NAME=activiti_production' -e 'DB_USER=activiti' -e DB_PASS=password' eternnoir/activiti:latest

HINT: After DB_USER=activiti and after the DB_HOST=... there were wrong apostrophes

After setting DB_TYPE I got a connection failure on startup when I tried to connect to a mysql database running on my host system. I could not get it run yet. It seemed like the container would not allow outgoing connections...

I tried then connecting two containers as described and that worked well