Update changelog for 3.1.8 release

git-svn-id: https://svn.apache.org/repos/asf/felix/trunk@1065512 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/fileinstall/doc/changelog.txt b/fileinstall/doc/changelog.txt
index 16840ed..cd21bfd 100644
--- a/fileinstall/doc/changelog.txt
+++ b/fileinstall/doc/changelog.txt
@@ -1,3 +1,9 @@
+Version 3.1.8
+-------------
+** Bug
+    * [FELIX-2799] - FileInstall creates multiple configurations for factory configurations on windows
+    * [FELIX-2798] - ArtifactListener services are not ordered according to the OSGi ranking
+
 Version 3.1.6
 -------------
 ** Bug