Update contact.md
Update contact.md

add a line break

Former-commit-id: 0dc9725480190c0521ccd6df2933be2a91488b8c [formerly a42f35b715de681c0b7e317fdbf997c8e5447681]
Former-commit-id: b3e45858f6ce8b7be6d7f643e93911363e34dce0
LibraryCarpentry/librarycarpentry.github.io,LibraryCarpentry/librarycarpentry.github.io,LibraryCarpentry/librarycarpentry.github.io