v4.0.0

• Drop support for Node versions older than 18
• Add ignore feature #70
• Fix support for postcss-load-config #102
• Fix repo and homepage urls #101
• Fix typo in readme #87
• Fix source maps #109
• Fix output path for async option, this is now relative to the process. (BREAKING!)
• Fix order of CSS, now the @font-face will be inserted after @charset, @import and similar statements. #107