credit for new csqrt - #524

Author: mohawk2

Changes

@@ -21,6 +21,7 @@
 - fix IO::Pic problem with older IO::GD installed (#522) - thanks @shawnlaffan
 - r2C and i2C now handle long double both real and complex (#524) - thanks @wlmb for report
 - add "update_data_from" method as streamlined get_dataref/upd_data
+- add Ops::csqrt{,_up} (#524) - thanks @wlmb
 
 2.098 2025-01-03
 - fix Windows build problems