Update Dockerfile

Dockerfile

@@ -77,7 +77,7 @@ RUN conda install -y python=${python_version} && \
       theano \
       mkdocs \
 
-RUN git clone git://github.com/keras-team/keras.git /src && pip install -e /src[tests] && \
+RUN git clone git://github.com/keras-team/keras.git /src && pip install -e /src[tests]
 RUN conda clean -yt
     # pip install git+git://github.com/keras-team/keras.git && \