Create Dockerfile, update readme

Dockerfile

@@ -0,0 +1,22 @@
+FROM python:3.7 as build
+
+WORKDIR /opt
+RUN pip install pyinstaller
+COPY . /opt
+RUN pip wheel -r requirements.txt
+RUN pip install -r /opt/requirements.txt && \
+    python setup.py install && \
+    pyinstaller -sF ./acme-runner.py
+
+
+FROM python:3.7-slim
+
+COPY --from=build /opt /opt
+
+WORKDIR /opt
+RUN pip install -r /opt/requirements.txt -f /opt && \
+    python setup.py install && \
+    cp dist/acme-runner /usr/bin/ && \
+    rm -rf /opt/* /root/.cache
+
+ENTRYPOINT ["/usr/local/bin/acme-nginx"]

README.md

@@ -106,6 +106,26 @@ cd acme-nginx
 python setup.py install
 ```
 
+### Docker way
+
+You can build docker image with acme-nginx inside:
+
+```
+docker build -t acme-nginx .
+docker run --rm -v /etc/nginx:/etc/nginx --pid=host \
+	-d example.com -d www.example.com
+```
+
+There is also single binary in docker image compiled by `pyinstaller` , you can copy it like this:
+
+```
+docker run --name acme acme-nginx
+docker cp acme:/usr/bin/acme-runner acme-nginx
+docker rm acme
+```
+
+
+
 ### Debian/Ubuntu way
 
 ```

acme_nginx/Acme.py

@@ -17,7 +17,7 @@
     from urllib2 import urlopen, Request  # Python 2
 
 
-__version__ = "0.2.0"
+__version__ = "0.2.1"
 
 
 class Acme(object):

setup.py

@@ -2,7 +2,7 @@
 
 from setuptools import setup, find_packages
 
-p_version = '0.2.0'
+p_version = '0.2.1'
 
 with open('README.md') as f:
     long_description = f.read()