Use __version__ from _version.py instead of hardcoding

Author: jni

src/skan/__init__.py

@@ -1,5 +1,4 @@
 from .csr import summarize, Skeleton, sholl_analysis
-
-__version__ = '0.11.1'
+from ._version import __version__
 
 __all__ = ['summarize', 'Skeleton', 'sholl_analysis']