Update tycho version to 0.26

Change-Id: I2206f91110f62083b75275cd6c6572d856f1b951
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>

pom.xml

diff --git a/pom.xml b/pom.xml
index 830de1e..a6c5632 100644
--- a/pom.xml
+++ b/pom.xml
@@ -40,7 +40,7 @@
   </licenses>
 
   <properties>
-    <tycho-version>0.22.0</tycho-version>
+    <tycho-version>0.26.0</tycho-version>
     <tycho-extras-version>${tycho-version}</tycho-extras-version>
     <egit-site>file:/${basedir}/../../egit/org.eclipse.egit.repository/target/repository</egit-site>
     <platform-version-name>mars</platform-version-name>