2.2.0

skip database if database name is null or empty
demo : how to use ExecuteSqlStructure ext method
update readme
not allow create new instance of ExtMigrationRunner
update demo

2.1.14

Check and show invalid migrate scripts before running

2.1.3

Use new migration attributes, make it more clean, easier to understand
Implement fluent setting
Use SortList for databaseKeys and databaseLayers