Fixed typo in simple charm

Change-Id: I9b5d9a41e1dd14ab387338c94afb0d740f2620ce
Signed-off-by: garciadeblas <gerardo.garciadeblas@telefonica.com>
diff --git a/juju-charms/layers/simple/metadata.yaml b/juju-charms/layers/simple/metadata.yaml
index 1105105..fd80d1a 100644
--- a/juju-charms/layers/simple/metadata.yaml
+++ b/juju-charms/layers/simple/metadata.yaml
@@ -1,5 +1,5 @@
 name: simple
-summary: A simple VNF proxy charm 
+summary: A simple VNF proxy charm
 maintainer: Adam Israel <adam.israel@canonical.com>
 subordinate: false
 series: ['xenial']