chore(pom): set min-version to upcoming release

Author: duncdrum

pom.xml

@@ -48,7 +48,7 @@
     <project.build.source>1.8</project.build.source>
     <project.build.target>1.8</project.build.target>
 
-    <exist.version>4.6.1</exist.version>
+    <exist.version>4.7.0</exist.version>
     <node.version>v11.14.0</node.version>
     <npm.version>6.9.0</npm.version>