Update CHANGELOG.md

CHANGELOG.md

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 Changelog
 =========
 
+v0.7.0
+------
+
+[Github Commits](https://github.com/PlasmaControl/DESC/compare/v0.6.4...v0.7.0)
+
+New Features
+- Add implementation of `Surface.compute_curvature`.
+- Add `return_data` flag to plotting functions to return dictionary of plotted data.
+- Add computation of beta, average B, surface curvature, magnetic field derivatives, and others.
+  Full list at https://desc-docs.readthedocs.io/en/stable/variables.html
+- Modify `Surface` classes to always orient surfaces correctly to give the equilibrium a positive Jacobian. This means DESC will always use a right handed coordinate system in both cylindrical and flux coordinates. Previously the orientation of the flux coordinate system would depend on the boundary parameterization.
+- New utility function `desc.compat.ensure_positive_jacobian` for converting previously saved equilibria to a right handed coordinate system.
+
+Major Changes
+- Refactored backend `compute` functions to calculate dependencies recursively. This should make it much easier to add new quantities, and reduces compilation times by 50-70%
+
+Minor Changes
+- Refactor wrapping of scipy optimizers.
+- Add check for incompatible constraints in optimization.
+- Improvements to `plot_1d` to correctly plot flux surface average quantities.
+- Speed up calculation of Boozer transform.
+- Have stability objectives print their max, min and average value at end of solve.
+
+Bug Fixes
+- Fix issue where if fixing specific boundary modes, the indices used to index the target do not match up with the indices of the A matrix.
+- Fix weighting of duplicate nodes for periodic domains.
+- Ensure transforms build correctly even with empty grid.
+- Ensure transforms always have 0,0,0 derivative.
+- Change normalization for poloidal field to avoid having a 0 normalization factor.
+
 
 v0.6.4
 ------