dev env for notebooks (#9)

* Update CONTRIBUTING.md

* latest awkward1 #8

> Whatever motivated the restriction to 0.2.3 is probably fixed by now or would be an easy fix, so you should switch to the latest version at your convenience.

* Update environment.yml

* python3 to python

* Update environment.yml

* Update environment.yml

* Update environment.yml

* Update CONTRIBUTING.md

.github/CONTRIBUTING.md

@@ -7,6 +7,7 @@ You should *always* use a virtual environment when developing software. Setup:
 python3 -m venv .env
 . .env/bin/activate
 pip install -e .[dev,test]
+python -m ipykernel install --user --name vector # For notebooks
 ```
 
 If you use conda environments and want to compare against ROOT:
@@ -15,6 +16,7 @@ If you use conda environments and want to compare against ROOT:
 conda env create
 conda activate vector
 conda config --env --add channels conda-forge  # Optional
+python -m ipykernel install --user --name vector # For notebooks
 ```
 
 You can update the environment with `conda env update`.

environment.yml

@@ -10,6 +10,6 @@ dependencies:
   - uproot >=3.11
   - numba >=0.46
   - pip:
-    - "awkward1>=0.2.3,!=0.2.4"
+    - "awkward1>=0.2.5"
     - "scikit-hep-testdata>=0.2.0"
     - -e .