Update Accessors URL for PdVega package. (#26653)

shawnbrown · TomAugspurger · commit c57f20636010 · 2019-06-05T06:53:40.000-05:00
See altair-viz/pdvega@7476a8a26b for details.
diff --git a/doc/source/ecosystem.rst b/doc/source/ecosystem.rst
@@ -363,4 +363,5 @@ Library        Accessor   Classes
 ============== ========== =========================
 
 .. _cyberpandas: https://cyberpandas.readthedocs.io/en/latest
-.. _pdvega: https://jakevdp.github.io/pdvega/
+.. _pdvega: https://altair-viz.github.io/pdvega/
+
