use Tycho 1.0.0 for building Mylyn

Change-Id: Ib247557e243289c3a7210fe62da8cc60a6f068de
diff --git a/org.eclipse.mylyn-parent/pom.xml b/org.eclipse.mylyn-parent/pom.xml
index 27e5447..25ce9a2 100644
--- a/org.eclipse.mylyn-parent/pom.xml
+++ b/org.eclipse.mylyn-parent/pom.xml
@@ -24,8 +24,8 @@
   </prerequisites>
 
   <properties>
-    <tycho-version>0.21.0</tycho-version>
-    <tycho-extras-version>0.21.0</tycho-extras-version>
+    <tycho-version>1.0.0</tycho-version>
+    <tycho-extras-version>${tycho-version}</tycho-extras-version>
 
     <mylyn-test-append></mylyn-test-append>