Bump httpclient from 4.5.2 to 4.5.13

Bumps httpclient from 4.5.2 to 4.5.13.

---
updated-dependencies:
- dependency-name: org.apache.httpcomponents:httpclient
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

pom.xml

@@ -36,7 +36,7 @@
     <properties>
         <jdk.version>1.6</jdk.version>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
-        <httpcomponents.version>4.5.2</httpcomponents.version>
+        <httpcomponents.version>4.5.13</httpcomponents.version>
         <guava.version>19.0</guava.version>
         <jackson.version>2.9.9</jackson.version>
         <junit.version>4.12</junit.version>