Postbird 0.7.1

On first launch you will probably have to Right Click > Open Postbird.app in order to bypass the Mac OS warning.

• Feature: Updating values in table
• Show NULL as “NULL”
• Fix CSV export, save more then 500 rows
• Better text for deletting rows (Thanks to @nickheiner-usds)
• Support Upper case for table names, columns, indexes
• Reduce content page size to 200 rows
• Add “Create Database” in top menu
• Add refreshing mat. view
• Fix renaming tables
• Skip alert when pg native exception not compiled
• Fix reset zoom & reload
• Update readme and contributing guide
• More async/await