Updated NEWS for release

Author: nikias

NEWS

@@ -1,3 +1,24 @@
+Version 2.7.0
+~~~~~~~~~~~~~
+
+- Changes:
+  * Add plist_new_unix_date, plist_get_unix_date_val, plist_set_unix_date_val functions
+    that work with int64_t values representing a UNIX timestamp instead of
+    using the 'MAC epoch'.
+    These new functions should be used instead of plist_new_date,
+    plist_get_date_val, and plist_set_date_val, which are now marked deprecated
+    and might be removed in a future version of libplist.
+  * Allow building the library without tool(s)
+  * Switch to more generic global initializer method
+  * json: Allow e+/E+ in exponent as per RFC 8259
+  * C++: Add more convenience functions to the interface
+  * C++: Add more type variants to different constructors and operators
+- Bugfixes:
+  * Fix segmentation fault when calling plist_sort() on an empty dictionary
+  * Fix compilation on MSVC
+  * C++: Fix bug in internal helper function of Array class
+  * C++: Fix String::GetValue memory leaking and support assignment of const char*
+
 Version 2.6.0
 ~~~~~~~~~~~~~