Update junit to 4.13.1 (#8)

diff --git a/pom.xml b/pom.xml
index d50f1bc..fe8f7d8 100755
--- a/pom.xml
+++ b/pom.xml
@@ -28,7 +28,7 @@
     <dependency>
       <groupId>junit</groupId>
       <artifactId>junit</artifactId>
-      <version>4.10</version>
+      <version>4.13.1</version>
       <scope>test</scope>
     </dependency>
     <dependency>