fix: increase length of node hash in the DAG.

There were cases where the hash shown was too short, because of the
switch over to version strings, like v1.2.1, which are 1 character too
long to be displayed. The length has been increased to 8 so that we can
accommodate version strings like v1.10.11

src/RepoDAG.js

@@ -74,7 +74,7 @@ function createNode(node, dagGraph, uuid, masterUUID) {
   }
 
   dagGraph.setNode(version, {
-    label: `${version}: ${node.UUID.substr(0, 5)}`,
+    label: `${version}: ${node.UUID.substr(0, 8)}`,
     class: nodeclass,
     rx: 5,
     ry: 5,