MAINT Deprecated spectral_r as well

NelleV · NelleV · commit 6d7aaee6fc5b · 2016-11-08T15:54:46.000-08:00
diff --git a/lib/matplotlib/_cm.py b/lib/matplotlib/_cm.py
@@ -1368,7 +1368,7 @@ def gfunc32(x):
 
 class _deprecation_datad(dict):
     def __getitem__(self, key):
-        if key == "spectral":
+        if key in ["spectral", "spectral_r"]:
             warn_deprecated(
                 "2.0",
                 name="spectral",
