fix:add postprocess and log bin fncs to init

src/py21cmfast_tools/__init__.py

@@ -1,3 +1,5 @@
 """py21cmfast_tools package."""
 
 from .lc2ps import calculate_ps as calculate_ps
+from .lc2ps import log_bin as log_bin
+from .lc2ps import postprocess_ps as postprocess_ps