[WAGON-608] Upgrade HttpClient to 4.5.13

This closes #78
diff --git a/wagon-providers/pom.xml b/wagon-providers/pom.xml
index 8336ce8..370699c 100644
--- a/wagon-providers/pom.xml
+++ b/wagon-providers/pom.xml
@@ -50,7 +50,7 @@
       <dependency>
         <groupId>org.apache.httpcomponents</groupId>
         <artifactId>httpclient</artifactId>
-        <version>4.5.12</version>
+        <version>4.5.13</version>
       </dependency>
       <dependency>
         <groupId>org.apache.httpcomponents</groupId>