Update tox to show installed dependencies

Author: samuelhwilliams

tox.ini

@@ -25,11 +25,15 @@ deps =
     -r requirements/tests.txt
 commands_pre =
     noflaskbabel: pip uninstall -y flask-babel
-commands = pytest -v --tb=short --basetemp={envtmpdir} flask_admin/tests {posargs}
+commands =
+    pip freeze
+    pytest -v --tb=short --basetemp={envtmpdir} flask_admin/tests {posargs}
 
 [testenv:py38-min]
 deps = -r requirements-skip/tests-min.txt
-commands = pytest -v --tb=short --basetemp={envtmpdir} flask_admin/tests -W 'default::DeprecationWarning' {posargs}
+commands =
+    pip freeze
+    pytest -v --tb=short --basetemp={envtmpdir} flask_admin/tests -W 'default::DeprecationWarning' {posargs}
 
 [testenv:style]
 deps = pre-commit