[nautilus-python] Bug #792348, Fix syntax error preventing building docs from python3

[Adam Plumb <adamplumb src gnome org>]

commit 6339d52e764db031fb2cba035917def121254394
Author: Adam Plumb <adamplumb gmail com>
Date:   Mon Jan 8 19:36:57 2018 -0500

    Bug #792348, Fix syntax error preventing building docs from python3

 docs/Makefile.am |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/docs/Makefile.am b/docs/Makefile.am
index 110cc71..3b2a0b7 100644
--- a/docs/Makefile.am
+++ b/docs/Makefile.am
@@ -74,7 +74,7 @@ REFERENCE_DEPS =      \
 if ENABLE_GTK_DOC
 
 reference/builddate.xml: $(REFERENCE_DEPS)
-       $(PYTHON) -c 'import datetime; print datetime.date.today()' > $@
+       $(PYTHON) -c 'import datetime; print(datetime.date.today())' > $@
 
 $(HTML_DATA): $(REFERENCE_DEPS) reference/builddate.xml
        $(GTKDOC_MKHTML) \