Merge branch 'main' into show-tracebacks

Author: tobiasraabe

.github/workflows/continuous-integration-workflow.yml

@@ -18,7 +18,7 @@ jobs:
       fail-fast: false
       matrix:
         os: ['ubuntu-latest', 'macos-latest', 'windows-latest']
-        python-version: ['3.6', '3.7', '3.8']
+        python-version: ['3.7', '3.8', '3.9']
 
     steps:
       - uses: actions/checkout@v2

.pre-commit-config.yaml

@@ -22,7 +22,7 @@ repos:
     -   id: rst-inline-touching-normal
     -   id: text-unicode-replacement-char
 -   repo: https://github.com/asottile/pyupgrade
-    rev: v2.19.4
+    rev: v2.21.0
     hooks:
     -   id: pyupgrade
         args: [--py36-plus]

environment.yml

@@ -5,7 +5,7 @@ channels:
   - nodefaults
 
 dependencies:
-  - python
+  - python=3.6
   - pip
   - setuptools_scm
   - toml
@@ -37,7 +37,6 @@ dependencies:
   - pdbpp
   - pre-commit
   - pytest-cov
-  - versioneer
 
   # Documentation
   - numpydoc