Harden stats script against potential issues

[stefandesu]

The following part of the stats script can cause issues for certain edge cases in the data:

bartoc.org/bin/stats.sh

Line 11 in 710f202

perl -nE 'say "{\"$2\": $1}" if $_ =~ /(\d+)\s+(.+)/' | jq . | jq -s add

For example, I noticed that some addresses contained a tab character (\t) which caused jq to throw an error here: "jq: parse error: Invalid string: control characters from U+0000 through U+001F must be escaped at line 48, column 21" I think in this particular case, the error is happening because those control characters (like \t, \n, etc.) are interpreted by Perl before being piped into jq. See also: jqlang/jq#1049 (comment)

I fixed the data at https://bartoc.org, so the script runs fine at the moment, but we should fix this at some point.