DEP: use lowercase cycler, like in conda-forge

Author: ivanovmg

environment.yml

@@ -52,7 +52,7 @@ dependencies:
   - botocore>=1.11
   - hypothesis>=3.82
   - moto  # mock S3
-  - Cycler  # test matplotlib colors cycle
+  - cycler  # test matplotlib colors cycle
   - flask
   - pytest>=5.0.1
   - pytest-cov