fixed trailing whitespace on line 1161

Author: knowltod

pandas/core/resample.py

@@ -1158,7 +1158,7 @@ def min(
         --------
         core.resample.Resampler.max : Compute max value of group.
         core.resample.Resampler.mean : Compute mean of groups, excluding missing values.
-        core.resample.Resampler.median : Compute median of groups, excluding missing 
+        core.resample.Resampler.median : Compute median of groups, excluding missing
             values.
 
         Examples