2.4.0.20

• New: Added netStandard 2.0 support (= netStandard 1.5 plus data read/write API)
• New: Full .net framework can use netStandard constructor (passing in DbConnection)
• Fix #51 - index columns order (thanks @xverwaerde)
• Load DbProviderFactory from external assembly - PR #46 (thanks @thomasjoscht )
• New databaseReader.TablesQuickView() method - fast loading with columns but no constraints/indexes/triggers - PR #49 (thanks @thomasjoscht )
• Reading nullable columns - PR #50 (thanks @xwiz )
• Migrations- Alter table/drop column for SQLite - PR #52 (thanks @xwiz )