fix typo

Author: fcakyon

Dockerfile

@@ -20,7 +20,7 @@ RUN apt-get update
 RUN apt-get install -y libgl1-mesa-dev
 
 # to fix: import cv2 > ImportError: libjasper.so.1: cannot open shared object file: No such file or directory
-RUN apt-get install libjasper1
+RUN apt-get install -y libjasper1
 
 RUN conda install -y anaconda-client conda-build conda-verify