Make python snippet compatible with python3

Change-Id: I5b80f21803fde566f2c2fdab643083f37383d2b0
Signed-off-by: Anatol Pomozov <anatol.pomozov@gmail.com>
diff --git a/scripts/build.sh b/scripts/build.sh
index a97ab07..1163d93 100755
--- a/scripts/build.sh
+++ b/scripts/build.sh
@@ -12,7 +12,7 @@
 
 # These are embedded directly into jiri itself and are available through `jiri version`.
 readonly GIT_COMMIT=$(git --git-dir="${GIT_DIR}/.git" --work-tree="${GIT_DIR}" rev-parse HEAD)
-readonly BUILD_TIME=$(python -c "import datetime; print datetime.datetime.utcnow().isoformat()")
+readonly BUILD_TIME=$(python -c "import datetime; print(datetime.datetime.utcnow().isoformat())")
 
 readonly CMAKE_PROGRAM=${CMAKE_PROGRAM:-cmake}
 readonly NINJA_PROGRAM=${NINJA_PROGRAM:-ninja}