0.4.0 New minor version with many new features.

• wav3d: Plot 3D wavefunction.
• wav1d: Plot 1D wavefunction.
• outcar.rs: Fix the issue when OUTCAR contains no 'external pressure' words.
• wavcar.rs: Add WAVECAR parser.
• Add --to-inline-html to plotters.

What's Changed

• Update rust.yml by @Ionizing in #4

Full Changelog: 0.3.6...0.4.0