Build docker of Python 3.8 (#214)

Dockerfile

@@ -1,4 +1,4 @@
-FROM python:3.7-alpine as base
+FROM python:3.8-alpine as base
 FROM base as builder
 
 COPY requirements.txt /app/
@@ -12,7 +12,8 @@ RUN pip install --upgrade pip && \
 FROM base
 
 LABEL com.abhinavsingh.name="abhinavsingh/proxy.py" \
-      com.abhinavsingh.description="⚡⚡⚡Fast, Lightweight, Programmable, TLS interception capable proxy server for Application debugging, testing and development" \
+      com.abhinavsingh.description="⚡⚡⚡ Fast, Lightweight, Pluggable, TLS interception capable proxy server focused on \
+        Network monitoring, controls & Application development, testing, debugging." \
       com.abhinavsingh.url="https://github.com/abhinavsingh/proxy.py" \
       com.abhinavsingh.vcs-url="https://github.com/abhinavsingh/proxy.py" \
       com.abhinavsingh.docker.cmd="docker run -it --rm -p 8899:8899 abhinavsingh/proxy.py"