v1.6.0-rc1

ezplatform-solr-search-engine changes between v1.5.4 and v1.6.0-rc1

Improvements

• EZP-30169: Drop Solr 4 support (#131)
• EZP-30139: As an editor I want to hide and reveal a content item (#133)

Bugs

• EZP-29984: Solr Field LIKE criterion is not behaving like on Legacy Storage Engine (#128)
• EZP-30136: Updating content with "ezuser" field will not commit changes to Solr (#130)