Upgrade all Python patch versions

Apply this commit (manually) into 5.x image version:

#139

Author: humitos

Dockerfile

@@ -8,9 +8,9 @@ ENV APPDIR /app
 ENV LANG C.UTF-8
 
 # Versions, and expose labels for external usage
-ENV PYTHON_VERSION_27 2.7.16
-ENV PYTHON_VERSION_36 3.6.8
-ENV PYTHON_VERSION_37 3.7.3
+ENV PYTHON_VERSION_27 2.7.18
+ENV PYTHON_VERSION_36 3.6.12
+ENV PYTHON_VERSION_37 3.7.9
 ENV PYPY_VERSION_35 pypy3.5-7.0.0
 ENV CONDA_VERSION 4.6.14
 LABEL python.version_27=$PYTHON_VERSION_27