[wip] Add JupyterLab 2.x-rc to test matrix (#34)

Author: bollwyvl

.github/env_specs/_base.yml

@@ -1,7 +1,6 @@
 channels:
   - conda-forge
   - nodefaults
-  - msys2
 dependencies:
   # enough stuff to run doit
   - doit

.github/env_specs/lab2rc.yml

@@ -0,0 +1,8 @@
+channels:
+  - conda-forge/label/jupyterlab_rc
+  - conda-forge
+  - nodefaults
+dependencies:
+  #                       v- otherwise you'll pull jupyterlab 3.0.0rc15
+  - jupyterlab >=2.3.0rc0,<3.0.0a0
+  - ipywidgets

.github/env_specs/meta.yml

@@ -1,6 +1,5 @@
 channels:
   - conda-forge
-  - msys2
   - nodefaults
 
 dependencies:
@@ -9,7 +8,7 @@ dependencies:
   - conda-lock
   - conda-verify
   - doit
-  - mamba >=0.7.3
+  - mamba >=0.7.8
   - pip
   - ripgrep
   - twine

.github/locks/docs/linux-64/conda.lock

@@ -1,5 +1,5 @@
 # platform: linux-64
-# env_hash: baf0cc369f22fad2db7764b3b3e0385b5cf603babfb56b20aa5e9b34a4ea7944
+# env_hash: 803f1426ad8c55206eed38fb7d5505aa1b192a85c546a5848a44eca55e43e5ad
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@@ -49,7 +49,7 @@ https://conda.anaconda.org/conda-forge/linux-64/python_abi-3.6-1_cp36m.tar.bz2#7
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-https://conda.anaconda.org/conda-forge/noarch/snowballstemmer-2.0.0-py_0.tar.bz2#fa34c3e7fb741022eb79169c354ca1ae
+https://conda.anaconda.org/conda-forge/noarch/snowballstemmer-2.1.0-pyhd8ed1ab_0.tar.bz2#f1d64c0cf0eedf655a96ccdc1573c05a
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@@ -76,40 +76,40 @@ https://conda.anaconda.org/conda-forge/linux-64/pyinotify-0.9.6-py36h5fab9bb_100
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-https://conda.anaconda.org/conda-forge/linux-64/pyzmq-21.0.1-py36h81c33ee_0.tar.bz2#fb2777995e39ce49c23d8f478d102ec1
+https://conda.anaconda.org/conda-forge/linux-64/pyyaml-5.4.1-py36h8f6f2f9_0.tar.bz2#c4be96c884afed3ce48ab143570a439f
+https://conda.anaconda.org/conda-forge/linux-64/pyzmq-20.0.0-py36h81c33ee_1.tar.bz2#19d2da0a63253abb429b4d48f6f3060c
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.github/locks/docs/osx-64/conda.lock

@@ -1,8 +1,8 @@
 # platform: osx-64
-# env_hash: 385ff5b9723149e328be230d06398dc78d54cda2c4a12f986804c85bb7e3e72c
+# env_hash: 5410e92d78b88b2659be6a04452905d740af16b0051bb0f8328a2e1bb8f79977
 @EXPLICIT
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+https://conda.anaconda.org/conda-forge/noarch/prompt_toolkit-3.0.13-hd8ed1ab_0.tar.bz2#87835bdb2c30cce8fad91bea2db0eace
 https://conda.anaconda.org/conda-forge/noarch/robotframework-seleniumlibrary-4.5.0-pyh9f0ad1d_0.tar.bz2#032239f822b29aef45cc4579ae86d031
 https://conda.anaconda.org/conda-forge/noarch/sphinx-3.4.3-pyhd8ed1ab_0.tar.bz2#159479e039e2739601b295565321db15
 https://conda.anaconda.org/conda-forge/osx-64/ipython-7.12.0-py36h5ca1d4c_0.tar.bz2#47ae34533a92316ba9c0d1ba59ca5c65
 https://conda.anaconda.org/conda-forge/noarch/nbsphinx-0.8.1-pyh44b312d_0.tar.bz2#4cd9c81db93ea4a9f68abb16a53e1e3c
 https://conda.anaconda.org/conda-forge/noarch/sphinx-autobuild-2020.9.1-pyhd8ed1ab_0.tar.bz2#e3c3714fb956b74c0d9c0f8859072ae0
 https://conda.anaconda.org/conda-forge/noarch/sphinx_rtd_theme-0.5.1-pyhd3deb0d_0.tar.bz2#c050f3a32c6e361917a54d10259b41bc
-https://conda.anaconda.org/conda-forge/osx-64/ipykernel-5.4.2-py36h9cf137f_0.tar.bz2#13efe2e3af22c104c6c2e87896b0e4d6
+https://conda.anaconda.org/conda-forge/osx-64/ipykernel-5.4.3-py36h9cf137f_0.tar.bz2#38dc2fa0eaf966212d87f8376a7e6072