v2.4

Upgrade Kotlin version to 1.3.40.
Auto detect the third-party logging framework we are using from the classpath, and delegate Ktorm's logs to it. #15
Use JDK ServiceLoader to find a dialect. Now we don't have to specify the dialect parameter explicitly while creating Database instances. #5
Add match and against functions for MySQL fulltext search, translated to its match ... against ... syntax. #25
Add insertOrUpdate function for PostgreSQL's data "upsert", translated to its on conflict (key) do update set syntax. #26
Other optimizations and bug fixes.

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