fix: Fix version getting in setup.py

py/MANIFEST.in

@@ -1 +1 @@
-include README-python.md LICENSE
+include README.md LICENSE version

py/setup.py

@@ -15,13 +15,27 @@
 with io.open(os.path.join(HERE, 'README.md'), encoding='utf-8') as f:
     long_description = '\n' + f.read()
 
+VERSION_PATH = os.path.join(HERE, 'version')
+
 
 def get_tag_version() -> str:
     result = subprocess.run(['git', 'describe', '--tags', '--abbrev=0'], stdout=subprocess.PIPE, encoding='ascii')
     version = result.stdout
     return version[1:] if version.startswith('v') else version
 
 
+def get_version():
+    """On build (in CI), the version should be written out, then included and be available during install."""
+    if os.path.exists(VERSION_PATH):
+        with open(VERSION_PATH) as vf:
+            return vf.read().strip()
+
+    tag_version = get_tag_version().strip()
+    with open(VERSION_PATH, 'w') as vf:
+        vf.write(tag_version)
+    return tag_version
+
+
 class UploadCommand(Command):
     """
     Support setup.py upload.
@@ -64,7 +78,7 @@ def run(self):
 
 setup(
     name='stencila-schema',
-    version=get_tag_version(),
+    version=get_version(),
     description='',
     long_description=long_description,
     long_description_content_type='text/markdown',