fix: syntx error

docker/python-3.6-gpu.dockerfile

@@ -0,0 +1,9 @@
+FROM nvidia/cuda:10.1-cudnn7-runtime-ubuntu18.04
+
+# TODO: Install cuda !
+RUN apt-get update && apt-get install -y ffmpeg libsndfile1
+RUN pip install musdb museval
+RUN pip install spleeter-gpu==1.4.4
+RUN mkdir -p /model
+ENV MODEL_PATH /model
+ENTRYPOINT ["spleeter"]