Release 5.4.0

gradle.properties

@@ -2,7 +2,7 @@ aspectjVersion=1.9.3
 gaeVersion=1.9.80
 springJavaformatVersion=0.0.24
 springBootVersion=2.4.0-M1
-version=5.4.0-SNAPSHOT
+version=5.4.0
 kotlinVersion=1.3.72
 org.gradle.jvmargs=-Xmx3g -XX:MaxPermSize=2048m -XX:+HeapDumpOnOutOfMemoryError
 org.gradle.parallel=true