Plugin doesn' work with sanples' UTF-8 names:

[Eljah]

For the sample name "Закрыто" we are getting metrics like that:

jmeter_response_histogram3_bucket{label="????? - ?????????",le="100.0",} 0.0
jmeter_response_histogram3_bucket{label="????? - ?????????",le="500.0",} 0.0
jmeter_response_histogram3_bucket{label="????? - ?????????",le="1000.0",} 0.0
jmeter_response_histogram3_bucket{label="????? - ?????????",le="3000.0",} 73.0
jmeter_response_histogram3_bucket{label="????? - ?????????",le="+Inf",} 128.0
jmeter_response_histogram3_count{label="????? - ?????????",} 128.0
jmeter_response_histogram3_sum{label="????? - ?????????",} 361254.0

[johrstrom]

Hey thanks for the ticket. I haven't been active on this repo in a while but this seems like the thing I'd pick up to fix if I did. So, I don't know when I'll get around to it, but when I do this is the update I'd do.