Add website to DESCRIPTION

[olivroy]

to improve discoverability https://blog.r-hub.io/2019/12/10/urls/

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• I have read the CONTRIBUTING document.
• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added tests to cover my changes.
• All new and existing tests passed.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (8405704) 93.68% compared to head (60589b5) 93.68%.

Additional details and impacted files

@@           Coverage Diff           @@
##            devel     #180   +/-   ##
=======================================
  Coverage   93.68%   93.68%           
=======================================
  Files          46       46           
  Lines        2961     2961           
=======================================
  Hits         2774     2774           
  Misses        187      187           

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[mstackhouse]

Thanks for the suggestion!