v0.4.0

The main component of this release is the support for Haskell syntax.
Other changes are listed below.

What's Changed

• Custom color scheme by @melvic-ybanez in #76
• Fix multiline parsing by @melvic-ybanez in #77
• Add tests for text-area contents (via Generate all) by @melvic-ybanez in #79
• Fix the start of the repl by @melvic-ybanez in #81
• Remove extra parens by @melvic-ybanez in #85
• Haskell support by @melvic-ybanez in #84
• Fix conjunction stringification by @melvic-ybanez in #86
• Fix Haskell rendering a function application over a lambda by @melvic-ybanez in #89
• Fix pattern matching for either over tuples by @melvic-ybanez in #90
• Include the output package by @melvic-ybanez in #91
• Fix Haskell tuple rendering by @melvic-ybanez in #92

Full Changelog: v0.3.0...v0.4.0