Updated changelog portion of readme

NEAMS Workbench 5.0.1 Release

- Upgraded Miniconda from version 2.7.13 to 3.8.2 

- Added cluster local installation to enable single install multiple user, on Linux desktop environments (e.g., Open OnDemand). See https://code.ornl.gov/neams-workbench/ncrc/

- Upgraded PyARC version 1.6.0 to 2.0.0

- Addressed issues with "localhost" functionality

## Release Notes

### NEAMS Workbench 5.0.1

#### Fixed

- Missing PyARC bundle components via incorporating Version 2.0.1

- Localhost configuration error due to Python3 incompatibility

- MCNP, Halite, and VERA Python3 runtime incompatibility

### NEAMS Workbench 5.0.0

#### Changed 

- Miniconda from version 2.7.13 to 3.8.2 

- PyARC version 1.6.0 to 2.0.0

#### Added

- Localhost cluster installation to enable single install multiple user, on Linux desktop environments (e.g., Open OnDemand). See https://code.ornl.gov/neams-workbench/ncrc/

For assistance and bug reporting, please email nwb-help@ornl.gov

Unzip the bundle archive.

Start the NEAMS Workbench.

    Workbench-4.1.1/bin/Workbench                 (Linux distribution)

    Workbench-4.1.1.app/Contents/MacOS/Workbench  (MacOS distribution)

    Workbench-4.1.1\bin\Workbench.exe             (Windows distribution)

    Workbench-5.0.1/bin/Workbench                 (Linux distribution)

    Workbench-5.0.1.app/Contents/MacOS/Workbench  (MacOS distribution)

    Workbench-5.0.1\bin\Workbench.exe             (Windows distribution)

Note: The first time Workbench is started on your machine an install-specific environment is setup.

      This can take a few minutes, so please be patient. A message stating `Testing for python using ...` will be presented in the terminal from which Workbench has been launched.