adding change log entry

Author: jyutzler

spec/annexes/background.adoc

@@ -210,6 +210,7 @@ All questions regarding this document should be directed to the editor or the co
 |2018-05-16| R15| Rich Fecher| 1.1.3.1.1| Clarifying use of extents in gpkg_contents with tiles content https://github.com/opengeospatial/geopackage/issue/426
 |2018-05-16| R15| Jeff Yutzler| Annex F.9 Table 23| Correcting typo in column name https://github.com/opengeospatial/geopackage/pull/434
 |2018-05-16| R15| Jeff Yutzler| Annexes F.1, F.6| Correcting incorrect ATS references https://github.com/opengeospatial/geopackage/issue/439
+|2018-05-17| R15| Jeff Yutzler| Annex F.3| Removing ATS entry associated with removed requirement https://github.com/opengeospatial/geopackage/pull/441
 |=======================================================================
 
 === Changes to the OGC® Abstract Specification