There is an ongoing outage on the primary CPAN mirror. It is possible to work around the issue by using MetaCPAN as a mirror.

SLOYD / Chart-GGPlot-0.0000_02 / Changes 
Revision history for Chart::GGPlot
 
0.0000_02   2019-03-12
  - Trying to fix a test.

0.0000_01   2019-03-10
  - First test release.