update citation

Treemmer.py

@@ -21,7 +21,7 @@
 # and joblib https://pythonhosted.org/joblib/ to run Treemmer
 
 # If you use Treemmer for your research, please cite:
-# Treemmer: a tool to reduce large phylogenetic datasets with minimal loss of diversity. Menardo et. al (2018), BMC Bioinformatics (in press).
+# Treemmer: a tool to reduce large phylogenetic datasets with minimal loss of diversity. Menardo et. al (2018),BMC Bioinformatics 19:164. https://doi.org/10.1186/s12859-018-2164-8
 
 from collections import defaultdict
 from joblib import Parallel, delayed
@@ -589,5 +589,5 @@ if ((stop == 0) or (arguments.plot_always)):														# create file for plot
 		make_plot()
 
 if (arguments.verbose > 0):
-	print "\n If you use Treemmer for your research, please cite:\n\n \"Treemmer: a tool to reduce large phylogenetic datasets with minimal loss of diversity\" Menardo et. al (2018), BMC Bioinformatics (in press)\n\n"
+	print "\n If you use Treemmer for your research, please cite:\n\n \"Treemmer: a tool to reduce large phylogenetic datasets with minimal loss of diversity\" Menardo et. al., BMC Bioinformatics (2018) 19:164\n\n"