README: changelog update

README.md

@@ -639,6 +639,10 @@ ulimit -n 2000
 
 ## Version history
 
+### 0.3.7
+* The issue with integer overflow with get_linecount of pypairix is now fixed. (no need to re-index).
+* Fixed issue where autoflip causes segmentation fault or returns an empty result on some systems. This affects `pairix -Y`, `pairix -a`, `pypairix.check_triangle()` and `pypairix.querys2D()`. It does not affect the results on 4DN Data Portal.
+
 ### 0.3.6
 * Line count (`pairix -n`) integer overflow issue has been fixed. The index structure has changed. The index generated by the previous versions (0.2.5 ~ 0.3.3, 0.3.4 ~ 0.3.5) can be auto-detected and used as well (backward compatible).