Update NEWS for 2.25.15

NEWS

@@ -2,6 +2,7 @@ Overview of Changes from GLib 2.25.14 to GLib 2.25.15
 =====================================================
 
  * GIO
+  - Memory leak fixes
   - The GZip(De}Compressor can now process header information
   - Support for network proxies has been added, with the GProxy
     interface and the gio-proxy-resolver extension point. GIO
@@ -40,11 +41,23 @@ Overview of Changes from GLib 2.25.14 to GLib 2.25.15
  627392 gdbus commit 8a3a4596 breaks win32 compile
  627407 FTBFS on !linux UNIX platforms
  627604 String error: 'that' twice in a row
+ 627969 ABR in g_file_open_tmp
+ 628084 gdbus-peer fails with assertion
+ 628193 Miscellaneous string fixes
+ 628296 abort() in gsocketconnection.c
+ 628309 Plug a mem leak in GConverterOutputStream
+ 628317 GEmblemedIcon:equal implementation is buggy
+ 628323 Fix invalid reads
+ 628327 Plug a mem leak
+ 628328 Plug a mem leak
+ 628329 Don't leak the FD list
 
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