turn down precision on PrePostFit doctest

Author: jpreszler

causalpy/pymc_experiments.py

@@ -139,14 +139,14 @@ class PrePostFit(ExperimentalDesign):
     ==================================Pre-Post Fit==================================
     Formula: actual ~ 0 + a + b + c + d + e + f + g
     Model coefficients:
-    a                             0.34, 94% HDI [0.30, 0.38]
-    b                             0.05, 94% HDI [0.01, 0.09]
-    c                             0.31, 94% HDI [0.26, 0.35]
-    d                             0.06, 94% HDI [0.01, 0.10]
-    e                             0.02, 94% HDI [0.00, 0.07]
-    f                             0.19, 94% HDI [0.11, 0.26]
-    g                             0.04, 94% HDI [0.00, 0.08]
-    sigma                         0.26, 94% HDI [0.22, 0.30]
+    a                             0.3, 94% HDI [0.3, 0.3]
+    b                             0.0, 94% HDI [0.0, 0.0]
+    c                             0.3, 94% HDI [0.2, 0.3]
+    d                             0.0, 94% HDI [0.0, 0.1]
+    e                             0.0, 94% HDI [0.0, 0.0]
+    f                             0.1, 94% HDI [0.1, 0.2]
+    g                             0.0, 94% HDI [0.0, 0.0]
+    sigma                         0.2, 94% HDI [0.2, 0.3]
     """
 
     def __init__(