Bump httpclient from 4.5.12 to 4.5.13 in /core

Bumps httpclient from 4.5.12 to 4.5.13.

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

Closes #123

Change-Id: Ie1fc9b2ee6fc98efb063d1d70ff33707bc642a04
diff --git a/core/pom.xml b/core/pom.xml
index cb6dde4..8e91fa7 100644
--- a/core/pom.xml
+++ b/core/pom.xml
@@ -460,7 +460,7 @@
 		<dependency>
 			<groupId>org.apache.httpcomponents</groupId>
 			<artifactId>httpclient</artifactId>
-			<version>4.5.12</version>
+			<version>4.5.13</version>
 		</dependency>
 		<dependency>
 			<groupId>commons-io</groupId>