Merge pull request #16 from anaconda-distribution/smartin_fix_pre-commit

Fixes pre-commit issue

.pre-commit-config.yaml

@@ -50,12 +50,9 @@ repos:
   hooks:
   - id: mypy
     # `mypy` is run as a system script to ensure that it is checking against
-    # the libraries we have installed. Having `pre-commit` handle dependencies
-    # leaves to headache-inducing mismatches and inaccuracies. This also allows
-    # us to type-check internal libraries that aren't widely publicly available,
-    # like `percy`.
+    # the libraries we have installed to the environment.
     language: system
-    args: [--config-file=.mypy.ini]
+    args: [--config-file=.mypy.ini, "--cache-dir=/dev/null"]
 # `pre-commit` no longer provides a hook for `pytest`, by design
 - repo: local
   hooks: