update the changelog

Merge pull request j4mie#125 from j4mie/develop

Release 1.5.5

Add changelog for j4mie#99

Document new release in changelog

Update the change log for 1.5.2 release

Remove HHVM build target

Add release date

Merge pull request j4mie#80 from j4mie/develop

Idiorm issue #156 findMany() returns only the last record in a set

Tag version 1.4.1

Tag version 1.4.0