Upgrade http request to version 4.1

Closes pockethub#340

Author: atermenji

app/pom.xml

@@ -68,7 +68,7 @@
     <dependency>
       <groupId>com.github.kevinsawicki</groupId>
       <artifactId>http-request</artifactId>
-      <version>3.0</version>
+      <version>4.1</version>
     </dependency>
     <dependency>
       <groupId>com.github.kevinsawicki</groupId>