Fixes pip bootstrap error

Signed-off-by: Philipp Schlarb <[email protected]>

Author: pSchlarb

libindy/ci/wrappers/python.dockerfile

@@ -6,7 +6,7 @@ RUN apt-get update && \
       python3.5 \
       python-setuptools
 
-RUN curl -fsSL -o- https://bootstrap.pypa.io/pip/get-pip.py | python3.6
+RUN curl -fsSL -o- https://bootstrap.pypa.io/pip/3.6/get-pip.py  | python3.6
 
 RUN pip install -U \
 	setuptools \