Update Views Data Export module to 3.0-beta8

src/cambridge/cambridge.make

@@ -63,7 +63,7 @@ projects[varnish][patch][] = "https://gist.github.com/thewilkybarkid/6595676/raw
 projects[varnish][patch][] = "http://cgit.drupalcode.org/varnish/patch/?id=d4cddfed72855199be9dd0047f5d80183c723ac0"
 projects[varnish][patch][] = "http://www.drupal.org/files/issues/purge-site-aliases-2185281-1.patch"
 projects[views_bulk_operations] = "3.2"
-projects[views_data_export] = "3.0-beta7"
+projects[views_data_export] = "3.0-beta8"
 projects[webform] = "3.20"
 projects[workbench] = "1.2"
 projects[workbench_access] = "1.2"