0.4.0

What's Changed

• Fix delete bug by @srmnitc in #73
• Relax requirements by @srmnitc in #74
• change name defs by @srmnitc in #75
• Improved workflow annotation by @srmnitc in #76
• Add substitutional impurity by @srmnitc in #78
• Add interstitial by @srmnitc in #79
• Change name by @srmnitc in #82

Full Changelog: 0.2.5...0.4.0