Allow more valid characters for prom label #41
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According to https://prometheus.io/docs/concepts/data_model/#metric-names-and-labels, capital letters are valid as the first character. This allows parsing something like https://github.com/NVIDIA/dcgm-exporter.
This is not actually a complete fix for parsing, since metric names and metric labels have a slightly different form, but this fixes an issue someone on slack was having with this package.