Create RELEASE-NOTES-2.4.2.md (SemanticMediaWiki#2008)

Author: kghbln

docs/releasenotes/RELEASE-NOTES-2.4.2.md

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+# Semantic MediaWiki 2.4.2
+
+Released on November 12nd, 2016.
+
+## Bug fixes
+
+* #1829 Only have the `DisplayTitlePropertyAnnotator create an annotation in case `SMW_DV_WPV_DTITLE` is enabled
+* #1883 Avoid mismatch in case `hasSubSemanticData` has been overridden as by `Sql3StubSemanticData`
+* #1885 Fixed postgres bytea escape/unescape on blob fields
+* #1887 Moved `Hooks:CanonicalNamespaces` to an earlier execution point
+* #1897 Work around deprecated/removed `DatabaseBase::getSearchEngine`
+* #1901 Make `enableSemantics` call `NamespaceManager`
+* #1911 Improve compatibility with MediaWiki 1.28+