Version 0.4.0

Bug Fixes

• Add Flow types (3beb70d)
• Fix linting errors (c58b642)

Features

• Add mock interpreter for FileSystem effects (f83bc25)
• Remove onPure (c9b0c06)
• Update function definition for run and FileSystem.writeFile (2f92484)
• Update function names and parameters (104c4e8)