Update README.md

Author: janza

README.md

@@ -1,6 +1,6 @@
 [![Docker Automated buil](https://img.shields.io/docker/automated/jjanzic/docker-python3-opencv.svg)]()
 
-Docker image with python 3.6 and opencv 3.4.1
+Docker image with python 3.7 and opencv 3.4.2
 
 Usage:
 
@@ -11,8 +11,10 @@ Image tagged with `:contrib` contains docker image built with [contrib modules](
 
 List of available docker tags:
 
-- `opencv-3.4.1` (`latest` branch)
-- `contrib-opencv-3.4.1` (`opencv_contrib` branch)
+- `opencv-3.4.2` (`latest` branch)
+- `contrib-opencv-3.4.2` (`opencv_contrib` branch)
+- `opencv-3.4.1`
+- `contrib-opencv-3.4.1`
 - `opencv-3.4.0`
 - `contrib-opencv-3.4.0`
 - `opencv-3.3.0`