Fix warning because of unescaped '\s'

bryant1410 · web-flow · commit 68f46a1198ee · 2019-02-04T23:05:57.000-05:00
diff --git a/csvkit/grep.py b/csvkit/grep.py
@@ -6,7 +6,7 @@
 
 
 class FilteringCSVReader(six.Iterator):
-    """
+    r"""
     Given any row iterator, only return rows which pass the filter.
     If 'header' is False, then all rows must pass the filter; by default, the first row will be passed
     through untested.
