Update CHANGELOG.md

Pulpissimo 6.0.0

Pulpissimo 5.0.0

Merge pull request pulp-platform#68 from pulp-platform/marcowidmer-fp…

…ga-zcu104

PULPissimo with new RISC-V compliant debug interface

PULPissimo with support for RISC-V PMP and priv spec 1.10

added new version of pulp_soc with few fixes

added new version of pulp_soc with few fixes

removed bypass clock

Tagged version 1.0