updating pgcli to 0.20.1

Author: dencold

Dockerfile

@@ -1,7 +1,7 @@
 FROM python:2.7.10-slim
 MAINTAINER Dennis Coldwell <dennis.coldwell@gmail.com>
 RUN apt-get -y update && apt-get -y install libpq-dev build-essential
-RUN pip install pgcli==0.19.2
+RUN pip install pgcli==0.20.1
 ADD run-pgcli.sh /bin/run-pgcli.sh
 CMD ["run-pgcli.sh"]