Update realm 3.0.2 for swift 4.0.2

Libraries external/Realm/Realm.framework/CHANGELOG.md

@@ -1,3 +1,14 @@
+3.0.2 Release notes (2017-11-08)
+=============================================================
+
+Prebuilt frameworks are now included for Swift 3.2.2 and 4.0.2.
+
+### Bugfixes
+
+* Fix a crash when a linking objects property is retrieved from a model object instance via
+  Swift subscripting.
+* Fix incorrect behavior if a call to `posix_fallocate` is interrupted.
+
 3.0.1 Release notes (2017-10-26)
 =============================================================