Bump regex from 0.1.80 to 1.5.5 in /book-master#6

dependabot[bot] wants to merge 1 commit intomasterIThawk/rust-project:masterfrom

dependabot/cargo/book-master/regex-1.5.5IThawk/rust-project:dependabot/cargo/book-master/regex-1.5.5Copy head branch name to clipboard