volumes long-syntax doesn't work

[abitrolly]

Conversion matrix specifies that volumes: long-syntax works, but it doesn't, because it requires at least version: '3.2`` in the header to be loaded. For example, this fails to validate with docker-compose`:

version: '3'
services:
  cs-btcd:
    image: cybernode/bitcoin-btcd:temp
    volumes:
      - type: volume
        source: /cyberdata

✗ docker-compose config 
ERROR: The Compose file './docker-compose.yml' is invalid because:
services.cs-btcd.volumes contains an invalid type, it should be a string

The same error is reported by kompose:

✗ kompose convert
FATA services.cs-btcd.volumes.0 must be a string  

Changing version to 3.2 makes docker-compose config pass, but kompose still fails there:

✗ kompose convert       
FATA Version 3.2 of Docker Compose is not supported. Please use version 1, 2 or 3 

[abitrolly]

Related to #725

[surajnarwade]

@abitrolly , as of now we don't support docker-compose 3.2 yet
@cdrage we should update conversion-matrix accordingly

[abitrolly]

Looks like there is some partial support in https://github.com/kubernetes/kompose/blob/master/pkg/loader/compose/v3.go#L120

[xianlubird]

Maybe we can support version 3.1-3.2-3.3-3.4. Docker compose in version 3.x develop fast and many attribute is added into it. We can work together to develop support these new attribute.We can support 3.1 first and step by step to next version.

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[surajnarwade]

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