sdbus++: switch to python3

Python2 is DEAD!  Long live Python3!

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: Ifd46a4aeb41fb0e6db2f4310a603b727a5a2c2ff
diff --git a/configure.ac b/configure.ac
index 11c189b..ec65562 100644
--- a/configure.ac
+++ b/configure.ac
@@ -29,7 +29,7 @@
 AC_PROG_MAKE_SET
 
 # setup sdbus++
-AM_PATH_PYTHON([2.7], [AC_SUBST([PYTHON], [echo "$PYTHON"])])
+AM_PATH_PYTHON([3.0], [AC_SUBST([PYTHON], [echo "$PYTHON"])])
 AC_SUBST([PYTHONDIR], ${pythondir})
 AS_IF([test "$PYTHON" != :], [have_python=yes], [have_python=no])