added missing parameters in vector_stream_network_analysis (#87)

Fixes issue #78 vector_stream_network_analysis function fails due to missing arguments.

Author: speleophysics

whitebox/whitebox_tools.py

@@ -13291,7 +13291,7 @@ def tributary_identifier(
             "tributary_identifier", args, callback
         )  # returns 1 if error
 
-    def vector_stream_network_analysis(self, streams, output, snap=0.1, callback=None):
+    def vector_stream_network_analysis(self, streams, dem, output, cutting_height=10, snap=0.1, callback=None):
         """This tool performs common stream network analysis operations on an input vector stream file.
 
         Keyword arguments: