allow quotes around version in Makefile.PL

diff --git a/helpers/bump-version b/helpers/bump-version
index 0804e45..af3ecad 100755 (executable)
--- a/helpers/bump-version
+++ b/helpers/bump-version
@@ -61,7 +61,7 @@ my $FILE_RE = qr{
   (.*)$
 }x;
 my $MAKE_RE = qr{
-  (^.* version \s* => \s* )
+  (^.* ['"]?version['"] \s* => \s* )
   (['"]?) v?([0-9]+(?:[._][0-9]+)*) \2
   ( \s*, )
   (?: