message: Change V to CPYTHON_VERSION
  to address review feedback
diff: @@ -30,13 +30,13 @@ R -e 'install.packages(c("tensorflow", "tfdatasets"), quiet = TRUE)'
  R -e 'install.packages(c("testthat", "devtools"), quiet = TRUE)'
  R -e 'install.packages(c("forge"), quiet = TRUE)'
  -V=$(python3 -c 'import sys; print(str(sys.version_info[0])+str(sys.version_info[1]))')
  -python3 -m pip install wheelhouse/*-cp${V}-*.whl
  +CPYTHON_VERSION=$(python3 -c 'import sys; print(str(sys.version_info[0])+str(sys.version_info[1]))')
  +python3 -m pip install wheelhouse/*-cp${CPYTHON_VERSION}-*.whl
  python3 -m pip install -q pytest boto3 pyarrow==0.11.1 pandas==0.19.2
  (cd tests && python3 -m pytest .)
  -V=$(python -c 'import sys; print(str(sys.version_info[0])+str(sys.version_info[1]))')
  -python -m pip install wheelhouse/*-cp${V}-*.whl
  +CPYTHON_VERSION=$(python -c 'import sys; print(str(sys.version_info[0])+str(sys.version_info[1]))')
  +python -m pip install wheelhouse/*-cp${CPYTHON_VERSION}-*.whl
  python -m pip install -q pytest boto3 pyarrow==0.11.1 pandas==0.19.2
  (cd tests && python -m pytest .)
  