update caldav-0.7.1

dev-python/caldav/metadata.xml

@@ -5,4 +5,12 @@
     <email>b@edevau.net</email>
     <name>Andreas Billmeier</name>
   </maintainer>
+  <upstream>
+    <remote-id type="pypi">caldav</remote-id>
+    <doc>https://pythonhosted.org/caldav/</doc>
+    <maintainer status="unknown">
+      <email>cyril@hippie.io</email>
+      <name>Cyril Robert</name>
+    </maintainer>
+  </upstream>
 </pkgmetadata>