Bump version, depend on sxs package

Author: nilsvu

setup.cfg

@@ -1,10 +1,10 @@
 
 [metadata]
 name = gwpv
-version = 0.3.0
+version = 0.4.0
 description = Visualize gravitational waves with ParaView
 author = Nils L. Vu
-author_email = [email protected].de
+author_email = owls@nilsvu.de
 url = https://nilsvu.github.io/gwpv
 license = MIT
 classifiers =
@@ -27,6 +27,7 @@ install_requires =
     rich
     scipy
     spherical
+    sxs
 
 [options.packages.find]
 include = gwpv*