What's new in this release?

• [New] A new hashing class has been added Crc32MetaDataHash. It let you work with large files as the hash is calculated using metadata of files: filename, size, mtime and mode. (Thanks to @pecuchet. See PR #9).
• [New] The interface ContentHashInterface has been renamed to HashInterface. Now, the method hash receives a filename instead of the filename content.