lister_transports: load version by using vcversioner's export module

.gitignore

@@ -7,3 +7,4 @@ __pycache__
 dist
 *.egg-info
 version.txt
+swh/lister/_version.py

setup.py

@@ -25,6 +25,6 @@ setup(
     scripts=['bin/ghlister'],
     install_requires=parse_requirements(),
     setup_requires=['vcversioner'],
-    vcversioner={},
+    vcversioner={'version_module_paths': ['swh/lister/_version.py']},
     include_package_data=True,
 )

swh/lister/core/lister_transports.py

@@ -9,9 +9,13 @@ from email.utils import parsedate
 from pprint import pformat
 
 import requests
-import vcversioner
 import xmltodict
 
+try:
+    from swh.lister._version import __version__
+except ImportError:
+    __version__ = 'devel'
+
 from .abstractattribute import AbstractAttribute
 from .lister_base import FetchError
 
@@ -92,7 +96,7 @@ class SWHListerHttpTransport(abc.ABC):
             raise NameError('HTTP Lister Transport requires api_baseurl.')
         self.api_baseurl = api_baseurl  # eg. 'https://api.github.com'
         self.session = requests.Session()
-        self.lister_version = vcversioner.find_version().version
+        self.lister_version = __version__
 
     def transport_request(self, identifier):
         """Implements SWHListerBase.transport_request for HTTP using Requests.