Update qtil

scripts/prepare

@@ -3,5 +3,5 @@
 PROJDIR="$(cd "$(dirname "${0}")/../" && pwd)"
 
 if [[ ! -d "${PROJDIR}/lib/qtil" ]]; then
-    git clone https://github.com/akiraohgaki/qtil.git -b release-0.3.0 --single-branch --depth=1 "${PROJDIR}/lib/qtil"
+    git clone https://github.com/akiraohgaki/qtil.git -b release-0.3.1 --single-branch --depth=1 "${PROJDIR}/lib/qtil"
 fi