Install wheel in CI

Author: anders-kiaer

.github/workflows/webviz-config.yml

@@ -50,7 +50,7 @@ jobs:
 
       - name: 📦 Install webviz-config with dependencies
         run: |
-          pip install --upgrade pip
+          pip install --upgrade pip wheel
           pip install --use-feature=2020-resolver . 'pandas==${{ matrix.pandas-version }}'
 
       - name: 📦 Install test dependencies

README.md

@@ -47,6 +47,9 @@ The recommended and simplest way of installing `webviz-config` is to run
 pip install webviz-config
 ```
 
+> :warning: Unless you are using `pip` version `20.3` you should enable the new `pip`
+resolver when installing, i.e. `pip install --use-feature=2020-resolver webviz-config`.
+
 If you want to develop `webviz-config` and install the latest source code manually you
 can do something along the lines of:
 can run