function getNestedSpanName(mwName) {
      let spanName = `Nodejs/Middleware/Koa/${mwName}/`
      if (semver.gte(pkgVersion, '8.0.2')) {
        spanName += '/:second'
      } else {
        spanName += '/:first/:second'
      }
      return spanName
    }
Helper to decide how to name nested route segments
This diverged in 8.0.2 and we decided not to fix.
Instead of pinning the routers to a very old version we unleashed
and handle the differences.

See original issue: https://github.com/newrelic/node-newrelic-koa/issues/35
@param mwName