remove xmlpull from ucum.tests MANIFEST.MF

the original code does not use it either

bundles/org.eclipse.uomo.ucum.tests/META-INF/MANIFEST.MF

diff --git a/bundles/org.eclipse.uomo.ucum.tests/META-INF/MANIFEST.MF b/bundles/org.eclipse.uomo.ucum.tests/META-INF/MANIFEST.MF
index bffe32c..79b2ea8 100644
--- a/bundles/org.eclipse.uomo.ucum.tests/META-INF/MANIFEST.MF
+++ b/bundles/org.eclipse.uomo.ucum.tests/META-INF/MANIFEST.MF
@@ -9,6 +9,5 @@
 Export-Package: org.eclipse.uomo.ucum.tests
 Require-Bundle: org.junit;bundle-version="4.8.2",
  org.eclipse.uomo.util;bundle-version="0.6.0",
- org.eclipse.uomo.xml;bundle-version="0.6.0",
- org.xmlpull;bundle-version="1.1.3"
+ org.eclipse.uomo.xml;bundle-version="0.6.0"