pyln: Derive version from git for pyln-testing

contrib/pyln-testing/pyln/testing/__init__.py

@@ -1 +1,5 @@
-__version__ = "0.10.1"
+from .__version__ import __version__
+
+__all__ = [
+    "__version__",
+]

contrib/pyln-testing/setup.py

@@ -1,5 +1,4 @@
 from setuptools import setup
-from pyln.testing import __version__
 
 
 with open('README.md', encoding='utf-8') as f:
@@ -9,7 +8,6 @@ with open('requirements.txt', 'r') as f:
     requirements = [l.strip() for l in f]
 
 setup(name='pyln-testing',
-      version=__version__,
       description='Library to facilitate writing tests for for lightningd',
       long_description=long_description,
       long_description_content_type='text/markdown',
@@ -19,4 +17,13 @@ setup(name='pyln-testing',
       install_requires=requirements,
       license='MIT',
       packages=['pyln.testing'],
+      use_scm_version={
+          "root": "../..",
+          "relative_to": __file__,
+          "write_to": "contrib/pyln-testing/pyln/testing/__version__.py",
+          "write_to_template": "__version__ = \"{version}\"\n",
+          "version_scheme": "post-release",
+          "local_scheme": "no-local-version",
+      },
+      setup_requires=["setuptools_scm"],
       zip_safe=True)