Inline the dist description in pkg metadata

This is necessary because setuptools is about to deprecate supporting
LF in one-line metadata fields.

setup.cfg

@@ -3,10 +3,7 @@ name = proxy.py
 version = attr: proxy.common.version.__version__
 url = https://github.com/abhinavsingh/proxy.py
 download_url = https://github.com/abhinavsingh/proxy.py/archive/master.zip
-description =
-  ⚡⚡⚡Fast, Lightweight, Pluggable, TLS interception capable proxy
-  server focused on Network monitoring, controls & Application development,
-  testing, debugging.
+description = ⚡⚡⚡Fast, Lightweight, Pluggable, TLS interception capable proxy server focused on Network monitoring, controls & Application development, testing, debugging.
 long_description = file: README.md
 long_description_content_type = text/markdown
 author = Abhinav Singh