Bump spark-core_2.10 from 2.1.0 to 2.2.2

Bumps spark-core_2.10 from 2.1.0 to 2.2.2.

Signed-off-by: dependabot[bot] <support@github.com>
diff --git a/pom.xml b/pom.xml
index 1d160f5..f9636ee 100644
--- a/pom.xml
+++ b/pom.xml
@@ -46,7 +46,7 @@
     <zookeeper.version>3.4.6</zookeeper.version>
     <giraph.version>1.1.0</giraph.version>
     <solr.version>4.10.4</solr.version>
-    <spark.version>2.1.0</spark.version>
+    <spark.version>2.2.2</spark.version>
     <kafka.version>0.10.1.1</kafka.version>
     <phoenix.version>4.9.0-HBase-1.1</phoenix.version>
     <spark-smoke.version>${project.version}</spark-smoke.version>