7.3.0

Feature

• Add Placeholder attribute to Textwidget and TextAreaWidget @iFlameing
• Make the default block type (currently draftjs text) configurable @tiberiuichim @silviubogan

Internal

• Upgrade lodash dependency to 4.17.19 @tisto
• Add a new blocks helper method, getBlocks. It simplifies using getBlocksFieldname and getBlocksLayoutFieldname under a single method that returns ordered pairs of [blockid, blockvalue] @tiberiuichim