Merge pull request #319 from tgttunstall/master

Replaced deprecated 'rU' with 'r' to make this work on recent python

Author: johnlees

PopPUNK/utils.py

@@ -422,7 +422,7 @@ def readRfile(rFile, oneSeq=False):
     """
     names = []
     sequences = []
-    with open(rFile, 'rU') as refFile:
+    with open(rFile, 'r') as refFile:
         for refLine in refFile:
             rFields = refLine.rstrip().split("\t")
             if len(rFields) < 2: