Update devel TrackMate major version number to 9.

The v9 series will track our efforts in supporting 3D segmentation
results in TrackMate.
The v8 is reserved for our parallel effort in supporting SOTA
algorithms for bacterial dynamics and mask editing.

Author: tinevez

pom.xml

@@ -11,7 +11,7 @@
 
 	<groupId>sc.fiji</groupId>
 	<artifactId>TrackMate</artifactId>
-	<version>8.0.0-SNAPSHOT</version>
+	<version>9.0.0-SNAPSHOT</version>
 
 	<name>TrackMate</name>
 	<description>TrackMate plugin for Fiji.</description>