Update CHANGELOG for Feast v0.15.1

Signed-off-by: Felix Wang <[email protected]>

Add changelog for v0.15.0

Signed-off-by: Danny Chiao <[email protected]>

Update CHANGELOG for Feast v0.14.1

Signed-off-by: Felix Wang <[email protected]>

Add changelog for v0.14.0 (feast-dev#1930)

Signed-off-by: Felix Wang <[email protected]>

Tagging v0.13.0

Update CHANGELOG for Feast v0.12.1

Signed-off-by: Willem Pienaar <[email protected]>

Update CHANGELOG for Feast v0.12.0

Signed-off-by: Tsotne Tabidze <[email protected]>

Update CHANGELOG for Feast v0.11.0

Signed-off-by: Willem Pienaar <[email protected]>

Update CHANGELOG for Feast v0.10.8

Update CHANGELOG for Feast v0.10.7

Signed-off-by: Willem Pienaar <[email protected]>