added changelog

CHANGELOG.md

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+# Change Log
+
+## 0.2.0
+
+### Added
+- Added Target build scripts with `Target.prebuildScripts` and `Target.postbuildScripts`
+- Support for absolute paths in target sources, run script files, and config files
+- Add validation for incorrect `Target.configFiles`
+
+### Fixed
+- fixed some project objects sometimes having duplicate ids
+
+## 0.1.0
+First official release
+