Update Bluemix link.

[jeffpk62]

Small update to README file.

[codecov-io]

Codecov Report

Merging #261 into master will decrease coverage by 2.78%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #261      +/-   ##
==========================================
- Coverage   85.23%   82.44%   -2.79%     
==========================================
  Files          24       24              
  Lines        1219     1219              
==========================================
- Hits         1039     1005      -34     
- Misses        180      214      +34

Impacted Files	Coverage Δ
watson_developer_cloud/language_translator_v2.py	44.82% <0%> (-31.04%)	⬇️
..._developer_cloud/watson_developer_cloud_service.py	66.66% <0%> (-9.38%)	⬇️
watson_developer_cloud/tone_analyzer_v3.py	92.3% <0%> (-7.7%)	⬇️
watson_developer_cloud/dialog_v1.py	38.88% <0%> (-5.56%)	⬇️
watson_developer_cloud/document_conversion_v1.py	93.75% <0%> (-3.13%)	⬇️
watson_developer_cloud/visual_recognition_v3.py	98.73% <0%> (-1.27%)	⬇️

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