Setup Codecov

[ajusa]

Busted already supports creating coverage files, now set up a way to see coverage of tests visually.
Will reduce number of save related bugs too hopefully.

[ajusa]

COV=$(moon -c test2.moon 2>&1)
echo "$COV"
echo
readarray -t a < <(echo "$COV" | grep -P '^\*' | wc -l - test2.moon | head -n 2 | grep -Po '^\h+\d+')
L_COV=$((a[0]))
L_FILE=$((a[1]))
L_PERC=$(( L_COV * 100 / L_FILE ))
echo "Converage: ${L_PERC}% (${L_COV} out of ${L_FILE} lines)"

Something like this might help (credit: turbo from Moonscript Discord)