Fix broken binary diff test

In a recent commit to libgit2, binary diffs were changed to have a trailing empty line. This broke a test in test_diff because it compares it directly against the string. I've added the extra line to the expected output and the test now passes correctly.
libgit2 · Dec 16, 2015 · a5cfea2 · a5cfea2
1 parent 99dfce9
commit a5cfea2
Showing 1 changed file with 1 addition and 0 deletions.
diff --git a/test/test_diff.py b/test/test_diff.py
@@ -77,6 +77,7 @@
 
 literal 8
 Pc${NM&PdElPvrst3ey5{
+
 """
 
 DIFF_HEAD_TO_INDEX_EXPECTED = [