Update to python 3.7 and opencv 3.4.2

Author: janza

Dockerfile

@@ -1,5 +1,5 @@
-FROM python:3.6
-MAINTAINER Josip Janzic <josip.janzic@gmail.com>
+FROM python:3.7
+MAINTAINER Josip Janzic <josip@jjanzic.com>
 
 RUN apt-get update && \
         apt-get install -y \
@@ -16,14 +16,13 @@ RUN apt-get update && \
         libjpeg-dev \
         libpng-dev \
         libtiff-dev \
-        libjasper-dev \
         libavformat-dev \
         libpq-dev
 
 RUN pip install numpy
 
 WORKDIR /
-ENV OPENCV_VERSION="3.4.1"
+ENV OPENCV_VERSION="3.4.2"
 RUN wget https://github.com/opencv/opencv/archive/${OPENCV_VERSION}.zip \
 && unzip ${OPENCV_VERSION}.zip \
 && mkdir /opencv-${OPENCV_VERSION}/cmake_binary \
@@ -41,10 +40,11 @@ RUN wget https://github.com/opencv/opencv/archive/${OPENCV_VERSION}.zip \
   -DBUILD_TESTS=OFF \
   -DBUILD_PERF_TESTS=OFF \
   -DCMAKE_BUILD_TYPE=RELEASE \
-  -DCMAKE_INSTALL_PREFIX=$(python3.6 -c "import sys; print(sys.prefix)") \
-  -DPYTHON_EXECUTABLE=$(which python3.6) \
-  -DPYTHON_INCLUDE_DIR=$(python3.6 -c "from distutils.sysconfig import get_python_inc; print(get_python_inc())") \
-  -DPYTHON_PACKAGES_PATH=$(python3.6 -c "from distutils.sysconfig import get_python_lib; print(get_python_lib())") .. \
+  -DCMAKE_INSTALL_PREFIX=$(python3.7 -c "import sys; print(sys.prefix)") \
+  -DPYTHON_EXECUTABLE=$(which python3.7) \
+  -DPYTHON_INCLUDE_DIR=$(python3.7 -c "from distutils.sysconfig import get_python_inc; print(get_python_inc())") \
+  -DPYTHON_PACKAGES_PATH=$(python3.7 -c "from distutils.sysconfig import get_python_lib; print(get_python_lib())") \
+  .. \
 && make install \
 && rm /${OPENCV_VERSION}.zip \
 && rm -r /opencv-${OPENCV_VERSION}