v0.3.0

QuantumESPRESSOExpress v0.3.0

Diff since v0.2.1

Merged pull requests:

• New version: v0.2.1 (#74) (@singularitti)
• CompatHelper: bump compat for EquationsOfStateOfSolids to 0.4, (keep existing compat) (#75) (@github-actions[bot])
• Deprecate eos^(-1), use vsolve (#76) (@singularitti)