Bump major version digit

The javafx-maven-plugin and therapi configurations have been
removed, potentially breaking backwards build compatibility.

Author: ctrueden

pom.xml

@@ -4,7 +4,7 @@
 
 	<groupId>org.scijava</groupId>
 	<artifactId>pom-scijava-base</artifactId>
-	<version>19.0.1-SNAPSHOT</version>
+	<version>20.0.0-SNAPSHOT</version>
 	<packaging>pom</packaging>
 
 	<name>SciJava Base POM</name>