fix Python3 patch that broke unit tests

 import re

 import sys

@@ -24,14 +24,14 @@ class Peeker:

     def __iter__(self):

         return self

-    def next(self):

+    def __next__(self):

         if self.buffer:

             return self.buffer.pop(0)

         else:

             return next(self.iter)

     def __next__(self):

-        return self.next()

+        return next(self)

     def peek(self, n=0):

         """Return an item n entries ahead in the iteration."""

--- a/data/scripts/check-gff3.py

+++ b/data/scripts/check-gff3.py

@@ -1,4 +1,4 @@

 import re

 import sys

@@ -50,7 +50,7 @@ for line in sys.stdin:

@@ -50,7 +50,7 @@

         topleveltypes[values[2]] += 1

 print('\n===== Types =====')

 featuretypes.sort()

 for featuretype in featuretypes:

     count = counts[featuretype]

@@ -60,7 +60,7 @@ for featuretype in featuretypes:

@@ -60,7 +60,7 @@

     print('%s (%lu total, %lu top-level)' % (featuretype, count, topcount))

 print('\n===== Relationships (child --> parent) =====')