Update continuous.py

Author: soma2000-lang

pymc/distributions/continuous.py

@@ -838,6 +838,9 @@ def logcdf(value, loc, sigma):
         )
 
 
+wald = WaldRV()
+
+
 class Wald(PositiveContinuous):
     r"""
     Wald log-likelihood.
@@ -1646,6 +1649,9 @@ def logcdf(value, mu, sigma):
 Lognormal = LogNormal
 
 
+studentt = StudentTRV()
+
+
 class StudentT(Continuous):
     r"""
     Student's T log-likelihood.