Revert "Disabling EGit Github contribution"

This reverts commit 6039a0e27777e47d3c9cf4340c2732545e30f347.
I have restored the staging p2 repository from Nexus which was
overwritten by a misconfigured build job.

Change-Id: Ia8bf115805373ba593da911fb5a9c34763cf6fcb
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>
diff --git a/egit.aggrcon b/egit.aggrcon
index 5eb20f2..2f52d7d 100644
--- a/egit.aggrcon
+++ b/egit.aggrcon
@@ -18,7 +18,7 @@
       <categories href="simrel.aggr#//@customCategories[identifier='Collaboration']"/>
     </features>
   </repositories>
-  <repositories enabled="false" location="http://download.eclipse.org/egit/github/staging/v5.0.0.201805151920-m7" description="EGit GitHub Updates">
+  <repositories location="http://download.eclipse.org/egit/github/staging/v5.0.0.201805151920-m7" description="EGit GitHub Updates">
     <features name="org.eclipse.mylyn.github.feature.feature.group" versionRange="[5.0.0.201805151920-m7]">
       <categories href="simrel.aggr#//@customCategories[identifier='Collaboration']"/>
     </features>