Update CHANGELOG to release v.1.2

CHANGELOG

@@ -3,29 +3,34 @@ Ponca changelog
 
 
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-Current head (v.1.2 RC)
+Current head (v.1.3 RC)
+
+
+--------------------------------------------------------------------------------
+v.1.2
+This release introduces several bug fixes and minor improvements.
 
 - API
-    - [spatialPartitioning] Optimize memory use in knngraph queries (#104)
-    - [spatialPartitioning] Clean KdTree API (#122)
     - [fitting] Mark `Base` type as protected instead of private in CRTP classes (#119)
     - [fitting] Improve KdTreeNodes API by hiding internal memory layout, improve methods naming (#120)
+    - [spatialPartitioning] Clean KdTree API (#122)
 
 - Examples
     - Fix example cuda/ponca_ssgls (#109)
 
 - Bug-fixes and code improvements
     - [fitting] Use variadic template for basket extensions (#85)
     - [fitting] Fix current status issue (#108)
+    - [fitting] Fix sphere fit eigen solver (#112)
+    - [spatialPartitioning] Optimize memory use in knngraph queries (#104)
     - [spatialPartitioning] Fix potential compilation issues in KnnGraph (#111) 
     - [spatialPartitioning] Fix debug macros in KnnGraphRangeQuery (#121)
-    - [fitting] Fix sphere fit eigen solver (#112)
 
 -Docs
     - [fitting] Clarify documentation on FIT_RESULT (#108)
 
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-v.1.1 RC
+v.1.1
 This release improves the Spatial Partitioning Package with new features and
 improved doc, as well as several bug fixes and API improvements.