update whatsnew

Author: wholmgren

docs/sphinx/source/whatsnew/v0.5.1.rst

@@ -11,7 +11,10 @@ Bug fixes
 ~~~~~~~~~
 * Remove condition causing Overflow warning from clearsky.haurwitz
 * modelchain.basic_chain now correctly passes 'solar_position_method'
-  arg to solarposition.get_solarposition
+  arg to solarposition.get_solarposition (:issue:`370`)
+* ModelChain.prepare_inputs and ModelChain.complete_irradiance now
+  correctly pass the 'solar_position_method' argument to
+  solarposition.get_solarposition (:issue:`377`)
 
 Enhancements
 ~~~~~~~~~~~~