readme error: using diffy with docker

[ZhMi]

Hello, There seem to be two problems with the README file. I use the lastest docker which is updated three days ago.

---

Problem One: If I use the following command, there will be an error.

docker run -ti \
  -p 8880:8880 -p 8881:8881 -p 8888:8888 \
  diffy/diffy \
    -candidate=localhost:9992 \
    -master.primary=localhost:9990 \
    -master.secondary=localhost:9991 \
    -service.protocol=http \
    -serviceName="Test-Service" \
    -proxy.port=:8880 \
    -admin.port=:8881 \
    -http.port=:8888 \
    -rootUrl=localhost:8888

(1) Error in custom provider, java.lang.IllegalArgumentException: flag 'summary.email' not found
  at ai.diffy.DiffyServiceModule$.settings(DiffyServiceModule.scala:82) (via modules: com.google.inject.util.Modules$OverrideModule -> ai.diffy.DiffyServiceModule$)
  at ai.diffy.DiffyServiceModule$.settings(DiffyServiceModule.scala:82) (via modules: com.google.inject.util.Modules$OverrideModule -> ai.diffy.DiffyServiceModule$)
  while locating ai.diffy.proxy.Settings
Caused by: java.lang.IllegalArgumentException: flag 'summary.email' not found`

The command needs to add param 'summary.email'.

docker run -ti \
  -p 8880:8880 -p 8881:8881 -p 8888:8888 \
  diffy/diffy \
    -candidate=localhost:9992 \
    -master.primary=localhost:9990 \
    -master.secondary=localhost:9991 \
    -service.protocol=http \
    -serviceName="Test-Service" \
    -proxy.port=:8880 \
    -admin.port=:8881 \
    -http.port=:8888 \
    -rootUrl=localhost:8888
    -summary.email=""

This command will work fine.

---

Problem Two: docker build -t diffy .
This command executed failed.

Sending build context to Docker daemon  6.061MB
Step 1/8 : FROM hseeberger/scala-sbt
manifest for hseeberger/scala-sbt:latest not found

The Dockerfile use hseeberger/scala-sbt mirror.
https://hub.docker.com/r/hseeberger/scala-sbt/tags?page=2 But there is no version definition in the dockerFile. So the command will use lasted vision will be used. Mirror hseeberger/scala-sbt has no tag version called latest.

[puneetkhanduri]

Sorry for the trouble. Updated the readme.