BUG: last input line silently dropped when file doesn't end with newline

[zsbahtiar]

AnnotateRead in annotate.go uses ReadString('\n') in a loop that only processes lines when err == nil. If the last line of input doesn't end with \n, ReadString returns the line content together with io.EOF, and the loop skips it — silently dropping the last record

printf "1.1.1.1\n8.8.8.8" > /tmp/no_newline.txt
cat /tmp/no_newline.txt | zannotate --geoasn --geoasn-database=path/to/db.mmdb

actual

{"ip":"1.1.1.1","geoasn":{"asn":13335,"org":"CLOUDFLARENET"}}

want

{"ip":"1.1.1.1","geoasn":{"asn":13335,"org":"CLOUDFLARENET"}}
{"ip":"8.8.8.8","geoasn":{"asn":15169,"org":"GOOGLE"}}

[zsbahtiar]

pr: #58