Bump accumulo-core from 1.7.3 to 1.10.1 in /webindex (#22)

Bumps [accumulo-core](https://github.com/apache/accumulo) from 1.7.3 to 1.10.1.
- [Release notes](https://github.com/apache/accumulo/releases)
- [Commits](apache/accumulo@rel/1.7.3...rel/1.10.1)

---
updated-dependencies:
- dependency-name: org.apache.accumulo:accumulo-core
  dependency-type: direct:production
...

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webindex/pom.xml

@@ -35,7 +35,7 @@
     <module>modules/integration</module>
   </modules>
   <properties>
-    <accumulo.version>1.7.3</accumulo.version>
+    <accumulo.version>1.10.1</accumulo.version>
     <fluo-recipes.version>1.1.0-incubating</fluo-recipes.version>
     <fluo.version>1.2.0</fluo.version>
     <hadoop.version>2.6.3</hadoop.version>