Update changelog.

change_log.txt

 Version 0.8.0
 =============
 
-* Fully updated for Skyrim.
+* Merged numerous updates by alecu100, skyfox69, and ethatron; niflib
+  now fully supports Skyrim, and has plenty of new access functions.
+
+* Fix for tangent space flag in NiGeometryData::numUvSets (and
+  bsNumUvSets) getting erased when nifs were writing nif.
+
+* Fix for NiSkinPartition::numTriangles getting erased when writing
+  nif.
 
 Version 0.7.3
 =============