Add additional field to github issue template.
* Add additional field to github issue template.
Request the command line flags to the exporter.
* Update version flag for kingpin.
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### Host operating system: output of `uname -a`
-### node_exporter version: output of `node_exporter -version`
+### node_exporter version: output of `node_exporter --version`
<!-- If building from source, run `make` first. -->
+### node_exporter command line flags
+<!-- Please list all of the command line flags -->
+
### Are you running node_exporter in Docker?
<!-- Please note the warning above. -->
