Update flyway to 7.4

Author: davidmweber

README.md

@@ -21,7 +21,7 @@ If you would like to be named as an Community Maintainer, let us know via Twitte
 ### Getting started
 Adding Flyway to your build is very easy. First, update to your `project/plugin.sbt` file to include:
 ```sbtshell
- addSbtPlugin("io.github.davidmweber" % "flyway-sbt" % "7.0.0")
+ addSbtPlugin("io.github.davidmweber" % "flyway-sbt" % "7.4.0")
 ```
 Please check out [Maven Central](https://search.maven.org/search?q=g:io.github.davidmweber%20AND%20a:flyway-sbt&core=gav) 
 for versions of `flyway-sbt` for previous versions of Flyway.

build.sbt

@@ -1,5 +1,5 @@
-val flywayVersion = "7.0.0"
-val pluginVersion = "7.0.0"
+val flywayVersion = "7.4.0"
+val pluginVersion = "7.4.0"
 
 lazy val root = (project in file ("."))
     .enablePlugins(SbtPlugin)