v0.4.0

Features

• add Error, HttpException, and RuntimeException (a789eae)
• refactor code & add initial test (6e55539)
• update example dependencies and paths (34346a2)

Bug Fixes

• AppVeyor CI Action hotfix (57b84c1)
• AppVeyor CI Action hotfix (26a5250)
• code refactoring (0f2bd4f)
• module export links (5b426eb)
• normalize class names & build environment (eeb7f97)
• sort paths and names (f5c9ab5)
• update example (ac26bff)