Remove unknown-version-guard, it's not needed

km3io/__init__.py

 from pkg_resources import get_distribution, DistributionNotFound
 
-try:
-    version = get_distribution(__name__).version
-except DistributionNotFound:
-    version = "unknown version"
+version = get_distribution(__name__).version
 
 from .offline import OfflineReader
 from .daq import DAQReader