pyln: Bump pyln version to 0.9.3 before publishing on PyPI

Let's just keep pyln synched up with the c-lightning version

contrib/pyln-proto/setup.py

@@ -1,4 +1,5 @@
 from setuptools import setup
+from pyln.proto import __version__
 import io
 
 
@@ -9,7 +10,7 @@ with io.open('requirements.txt', encoding='utf-8') as f:
     requirements = [r for r in f.read().split('\n') if len(r)]
 
 setup(name='pyln-proto',
-      version='0.8.4',
+      version=__version__,
       description='Pure python implementation of the Lightning Network protocol',
       long_description=long_description,
       long_description_content_type='text/markdown',