Upgrade Tycho to 1.4.0 for eclipse build

Change-Id: I8893be53a5b45e1f4c177ff002b94c887576f128
Signed-off-by: Michael Keppler <Michael.Keppler@gmx.de>

org.eclipse.jgit.packaging/pom.xml

@@ -59,7 +59,7 @@
   <name>JGit Tycho Parent</name>
 
   <properties>
-    <tycho-version>1.3.0</tycho-version>
+    <tycho-version>1.4.0</tycho-version>
     <tycho-extras-version>${tycho-version}</tycho-extras-version>
     <target-platform>jgit-4.6</target-platform>
   </properties>