Update Dockerfile

Dockerfile

@@ -11,7 +11,7 @@ COPY . .
 RUN apt-get update && \
     apt-get install -y cmake && \
     pip install --no-cache-dir --upgrade pip && \
-    pip install --no-cache-dir --find-links https://github.com/trolltroll/python-dlib-wheels/releases/tag/v19.24.2 dlib==19.24.2　&& \
+    RUN pip install --no-cache-dir --find-links https://github.com/trolltroll/python-dlib-wheels/releases/tag/v19.24.2 dlib==19.24.2　&& \
     pip install --no-cache-dir --upgrade -r /app/requirements.txt
 
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