bpo-1812: Fix newline conversion when doctest.testfile loads from a package whose loader has a get_data method (GH-17385)

This pull request fixes the newline conversion bug originally reported in bpo-1812. When that issue was originally submitted, the open builtin did not default to universal newline mode; now it does, which makes the issue fix simpler, since the only code path that needs to be changed is the one in doctest._load_testfile where the file is loaded from a package whose loader has a get_data method.
diff --git a/Misc/ACKS b/Misc/ACKS
index 4e4d090..ce100b9 100644
--- a/Misc/ACKS
+++ b/Misc/ACKS
@@ -421,6 +421,7 @@
 Jaromir Dolecek
 Zsolt Dollenstein
 Brendan Donegan
+Peter Donis
 Ismail Donmez
 Ray Donnelly
 Robert Donohue