v0.7.1 is stamped to be compatible with the tower version 0.5
not bumping the minor version because I have not been able to find any incompatibilities in the tower 0.4 -> 0.5 upgrade that are utilized by this library
note: opentelemetry 0.25 libraries still use tonic 0.12 which is still utilizing tower 0.4, so this may result in multiple tower versions in your dependency tree