swh.loader.pypi: Fix release order

swh/loader/pypi/model.py

@@ -90,13 +90,20 @@ class PyPiProject:
     def fetch_release(self, release_name=None):
         pass
 
-    def releases(self):
+    def _sort_releases(self, releases_dict):
         # sort releases in ascending order
-        releases_dict = self.data['releases']
         _releases = list(releases_dict.keys())
-        _releases.sort()
+        __releases = []
+        for _release in _releases:
+            __releases.append([int(i) for i in _release.split('.')])
+        __releases.sort()
+        for rel in __releases:
+            yield '.'.join((str(i) for i in rel))
+
+    def releases(self):
         # The compute information per release
-        for version in _releases:
+        releases_dict = self.data['releases']
+        for version in self._sort_releases(releases_dict):
             release = releases_dict[version]
             if version == self.last_version:  # avoid an extra query
                 release_info = self.info()