message: update lightstep library
diff: @@ -52,8 +52,8 @@ REPOSITORY_LOCATIONS = dict(
  remote = "https://github.com/opentracing/opentracing-cpp",
  ),
  com_lightstep_tracer_cpp = dict(
  - commit = "4ea8bda9aed08ad45d6db2a030a1464e8d9b783f",
  - remote = "https://github.com/lightstep/lightstep-tracer-cpp", # v0.7.0
  + commit = "ae6a6bba65f8c4d438a6a3ac855751ca8f52e1dc",
  + remote = "https://github.com/lightstep/lightstep-tracer-cpp", # v0.7.1
  ),
  lightstep_vendored_googleapis = dict(
  commit = "d6f78d948c53f3b400bb46996eb3084359914f9b",
  