* Bump `base-notebook`
* OS version
* `jupyterlab`
* Bump `scipy-notebook`
* `beautifulsoup4`
* `cloudpickle`
* `dask`
* `numba`
* `xlrd`: version specified (it was not the case)
* Bump `datascience-notebook`
* `r-devtools`
* `r-forecast`
* Julia version
* Test added to check if Julia is correctly installed (`julia --version`)
* Note: A new version of `r-base` is out `4.0.0` however it cannot be installed yet since dependencies with other packages cannot be resolved.
* Bump `r-notebook`
* Same as `datascience-notebook` except Julia.
* Bump `all-spark-notebook`
* `r-sparklyr`
