http: fix plain Maven build
diff --git a/core/plugins/org.eclipse.hawk.http/pom-plain.xml b/core/plugins/org.eclipse.hawk.http/pom-plain.xml
index 8ad3aa5..061604f 100644
--- a/core/plugins/org.eclipse.hawk.http/pom-plain.xml
+++ b/core/plugins/org.eclipse.hawk.http/pom-plain.xml
@@ -23,5 +23,10 @@
<groupId>org.apache.httpcomponents</groupId>
<artifactId>httpclient</artifactId>
</dependency>
+ <dependency>
+ <groupId>commons-io</groupId>
+ <artifactId>commons-io</artifactId>
+ <version>2.2</version>
+ </dependency>
</dependencies>
</project>