Get the decoded value of the location attribute instead of using to_s, which leaves encoded entities. This fixes issues when an Xcode project path contains XML entities, which are double-encoded (for example, &apos; becomes &amp;apos;) when the workspace is later written out.
Update CHANGELOG.md with info about not XML encoding project paths when loading workspaces.
Update CHANGELOG to actually reflect the problem that is being solved by changing from to_s to value.