Updated Conversation API-Version

[jhoelzl]

Based on Release Notes in https://www.ibm.com/watson/developercloud/doc/conversation/release-notes.html

[CLAassistant]

All committers have signed the CLA.

[codecov-io]

Codecov Report

Merging #197 into master will decrease coverage by 2.69%.
The diff coverage is 100%.

@@            Coverage Diff            @@
##           master     #197     +/-   ##
=========================================
- Coverage   84.08%   81.39%   -2.7%     
=========================================
  Files          24       24             
  Lines        1150     1150             
=========================================
- Hits          967      936     -31     
- Misses        183      214     +31

Impacted Files	Coverage Δ
watson_developer_cloud/conversation_v1.py	100% <100%> (ø)	⬆️
watson_developer_cloud/language_translator_v2.py	44.82% <0%> (-31.04%)	⬇️
..._developer_cloud/watson_developer_cloud_service.py	63.54% <0%> (-9.38%)	⬇️
watson_developer_cloud/dialog_v1.py	38.88% <0%> (-5.56%)	⬇️
watson_developer_cloud/document_conversion_v1.py	93.75% <0%> (-3.13%)	⬇️

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[jsstylos]

Thanks! Can you sign the CLA?