[vte] git: Diff *.txt files as text

[Christian Persch <chpe src gnome org>]

commit 65d86418f3278b583f3f3bbe656e0aeb6114d6f7
Author: Christian Persch <chpe src gnome org>
Date:   Wed Oct 16 12:23:48 2019 +0200

    git: Diff *.txt files as text
    
    This fixes the diff for the perf/UTF-8-test.txt file, which git thinks
    is binary because it contains NUL bytes.

 .gitattributes | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/.gitattributes b/.gitattributes
new file mode 100644
index 00000000..837b153c
--- /dev/null
+++ b/.gitattributes
@@ -0,0 +1 @@
+*.txt  diff