Displaying the filename when the check-json hook fails with a UnicodeDecodeError - fix #148

testing/resources/bad_json_latin1.nonjson

diff --git a/testing/resources/bad_json_latin1.nonjson b/testing/resources/bad_json_latin1.nonjson
new file mode 100755
index 0000000..3b39473
--- /dev/null
+++ b/testing/resources/bad_json_latin1.nonjson
@@ -0,0 +1,3 @@
+{
+    "é": 1,
+}