Update burr_iii.py

Author: arnavk23

skpro/distributions/burr_iii.py

@@ -60,11 +60,11 @@ def _mean(self):
         scale = self._bc_params["scale"]
         return burr12.mean(c, 1, scale=scale)
 
-
     def _var(self):
         c = self._bc_params["c"]
         scale = self._bc_params["scale"]
         import numpy as np
+
         v = burr12.var(c, 1, scale=scale)
         # Match scipy: if nan, return nan; if negative/overflow, return inf
         if np.isnan(v):