upgrade Docker container image to use Ubuntu 20.04 (#35)

* upgrade Docker container to 20.04

* prepare for v0.4.12 release

Dockerfile

@@ -1,4 +1,4 @@
-FROM ubuntu:18.04
+FROM ubuntu:20.04
 LABEL maintainer="Ian Rees <ian@interline.io>,Drew Dara-Abrams <drew@interline.io>"
 
 ENV DEBIAN_FRONTEND=noninteractive
@@ -11,7 +11,7 @@ RUN apt-get update -y && apt-get install \
       osmctools \
       osmium-tool \
       pyosmium \
-      python-gdal \
+      libgdal-dev \
       gdal-bin \
       awscli \
       software-properties-common \

README.md

@@ -55,15 +55,15 @@ PlanetUtils is a "high level" library that makes use of [Osmosis](https://wiki.o
 Make sure you have [Docker](https://www.docker.com/community-edition) installed. Then:
 
 ```sh
-docker pull interline/planetutils:release-v0.4.11
+docker pull interline/planetutils:release-v0.4.12
 ```
 
 Any of the example commands below can be executed with `docker run`. It may be helpful to mount a local directory inside the container for persistence and to access output files.
 
 - Example of using `docker run` with the `data` directory mounted as `/data`:
 
 ```sh
-docker run --rm -v ${PWD}/data:/data -t interline/planetutils:release-v0.4.11 <command>
+docker run --rm -v ${PWD}/data:/data -t interline/planetutils:release-v0.4.12 <command>
 ```
 
 ### Using Homebrew on Mac OS

setup.py

@@ -9,7 +9,7 @@
     long_description = f.read()
 
 setup(name='interline-planetutils',
-    version='0.4.11',
+    version='0.4.12',
     description='Interline PlanetUtils',
     long_description=long_description,
     url='https://github.com/interline-io/planetutils',