Moves the pinning of the package "packaging" to >=19.2 to avoid issues with version 19.1 as reported at https://github.com/ContinuumIO/anaconda-issues/issues/11236
Moves the pinning of the package "packaging" to >=19.2 to avoid issues with version 19.1 as reported at https://github.com/ContinuumIO/anaconda-issues/issues/11236