Bump minimum pymc version for tests

Author: jessegrabowski

conda-envs/environment-test.yml

@@ -3,7 +3,7 @@ channels:
 - conda-forge
 - nodefaults
 dependencies:
-- pymc>=5.19.1
+- pymc>=5.20
 - pytest-cov>=2.5
 - pytest>=3.0
 - dask
@@ -13,4 +13,4 @@ dependencies:
 - pip:
   - blackjax
   - scikit-learn
-  - better_optimize>=0.0.10
+  - better_optimize