Use Tycho 0.26 for build.

Change-Id: I252dbf0751cc42a9c4859af62fb91fccf46c7e3c
Signed-off-by: Alexander Kurtakov <akurtako@redhat.com>
diff --git a/build/pom.xml b/build/pom.xml
index 31be5cc..f24859a 100644
--- a/build/pom.xml
+++ b/build/pom.xml
@@ -26,7 +26,7 @@
 	</modules>
 
 	<properties>
-		<tycho-version>0.25.0</tycho-version>
+		<tycho-version>0.26.0</tycho-version>
 		<tycho-groupid>org.eclipse.tycho</tycho-groupid>
 		<antrun-version>1.7</antrun-version>
 		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>