Update changelog

CHANGELOG.md

@@ -22,6 +22,10 @@ and the versioning aims to respect [Semantic Versioning](http://semver.org/spec/
 - product (#1912)
 - term tracker annotation (#1913)
 - licence provider, licensee, has licence provider, permits (#1925)
+- file oeo-tasks (#1940)
+- classes to oeo-tasks: data acquisition and pre-processing, extrapolate wind speed vertically to hub height, account for air density change, determine wind speed frequency distribution, determine seasonal/diurnal variability, determine the theoretical potential/WPD, determined wind characteristics of a region, determination method for wind characteristics of a region, method realization potential, determination process for wind characteristics of a region, process endpoint, determine wind characteristics of a region endpoint (#1940)
+- axioms in oeo-tasks to determination method for wind characteristics of a region, method realization potential, determination process for wind characteristics of a region (#1940)
+
 
 ### Changed
 - gams -> General Algebraic Modeling System (#1889)