test spectral-cube requirement

jeffjennings · jeffjennings · commit 302e9af57745 · 2024-10-10T00:09:41.000-04:00
diff --git a/tutorials/position-velocity-diagrams/requirements.txt b/tutorials/position-velocity-diagrams/requirements.txt
@@ -2,4 +2,4 @@ astropy
 numpy
 pvextractor
 matplotlib
-spectral_cube
+spectral_cube @ git+https://github.com/radio-astro-tools/spectral-cube  # as of: 2021-09-21
