Add POEditor to 'follow us' statement
Add POEditor to 'follow us' statement

We broke the follow us before by removing Facebook and Twitter. Adding
POEditor should fix it and help to attract new translators.

Signed-off-by: Sheogorath <1c2647ce2ee8a4ec8e5c8b1b245ca38f94844bab@shivering-isles.com>

jackycute/HackMD,Yukaii/hackmd,hackmdio/hackmd,jackycute/HackMD,Yukaii/hackmd,hackmdio/hackmd,hackmdio/hackmd,Yukaii/hackmd,jackycute/HackMD