adding latest version of haproxy 1.8 docker image, haproxy:1.8.30-alpine

[release]General improvements

- Seamless and more stable reloads
- TCP service groups
- Adds discoveryType support for global services
- Adds ssl syntax to BIND_PORTS
- HTTPS support without HTTP
- Healthchecks checks for initial configuration
- Multiple listeners with comma seperated LISTENER_ADDRESS
- Enables service filtering with com.df.proxyInstanceName and FILTER_PROXY_INSTANCE_NAME

Merge pull request #3 from RaymondMouthaan/patch-1

Update README.md

[release]Check resolvers

Custom resolvers can be specified through the new environment variable . Per-service resolving can be specified through the parameter . Please consult [Environment Variables](http://proxy.dockerflow.com/config/\#environment-variables) and [General Query Parameters](http://proxy.dockerflow.com/usage/\#general-query-parameters) for more info.

Merge branch 'master' of https://github.com/vfarcic/docker-flow-proxy

Starting from this release, field can be indexed. Fixes #443.

Merge branch 'master' of https://github.com/vfarcic/docker-flow-proxy

Starting from this release, binaries will be attached to each. Fixes …

…#386.

Fixes #355

Fixes #392