include sourmash_plugin_branchwater among dependencies

requirements-conda.txt

@@ -6,7 +6,7 @@ spades>=3.15.5
 fastani>=1.34
 mashtree>=1.4.6
 sourmash-minimal>=4.8.6 ## see below
-#sourmash_plugin_branchwater>=0.9.1  ## running into resolver problems at least with our current version of python
+sourmash_plugin_branchwater>=0.9.1  ## running into resolver problems at least with our current version of python
 skani>=0.2.1
 #kwip>=0.2.0 ## relies on khmer, which as of 2024-03-12 does not support python 3.10
 # Python packages below