added version bump script

Author: 256dpi

bump.sh

@@ -0,0 +1,15 @@
+#!/usr/bin/env bash
+
+old=$1
+new=$2
+
+echo "bump version from $old to $new..."
+
+sed -i '.bak' "s/$old/$new/g" library.properties
+rm library.properties.bak
+
+sed -i '.bak' "s/$old/$new/g" README.md
+rm README.md.bak
+
+sed -i '.bak' "s/$old/$new/g" src/YunMQTTClient.cpp
+rm src/YunMQTTClient.cpp.bak