Add UPGRADE-3.0.md file with descriptions of new features / changes
Add UPGRADE-3.0.md file with descriptions of new features / changes

alekitto/FazlandElasticaBundle,ramuss/FazlandElasticaBundle,fazland/FazlandElasticaBundle,fazland/FazlandElasticaBundle,ramuss/FazlandElasticaBundle,alekitto/FazlandElasticaBundle