Update changelog.

Author: shyuep

changes.md

@@ -6,7 +6,7 @@ nav_order: 2
 
 # Change Log
 
-## 0.4.7
+## v0.4.7
 1. **`ElasticityCalc` can now return moduli in GPa.**
    - Added a new `units_GPa` keyword argument (default `False`). When set to `True`, the returned `elastic_tensor`, `bulk_modulus_vrh`, `shear_modulus_vrh`, and `residuals_sum` are converted from pymatgen's native eV/A^3 units to GPa.
 2. **Bug fix in `EOSCalc`.**