v0.18.1

• Crystal 0.21.0 support
• Drop multipart.cr dependency. multipart support is now built-into Crystal <3
• Since Crystal 0.21.0 comes built-in with multipart there are some improvements and deprecations.

meta has been removed from FileUpload and it has the following properties

• tmpfile: This is temporary file for file upload. Useful for saving the upload file.
• filename: File name of the file upload. (logo.png, images.zip e.g)
• headers: Headers for the file upload.
• creation_time: Creation time of the file upload.
• modification_time: Last Modification time of the file upload.
• read_time: Read time of the file upload.
• size: Size of the file upload.