message: fix misstake
diff: @@ -35,7 +35,7 @@ WORKDIR $HOME/incubator-superset
  COPY ./ ./
  -RUN RUN mkdir -p /home/work/.cache
  +RUN mkdir -p /home/work/.cache
  RUN pip install --upgrade setuptools pip
  RUN pip install -r requirements.txt
  RUN pip install -r requirements-dev.txt
  