Added script to update version numbers in all relevant places.

update_version.sh

@@ -0,0 +1,18 @@
+#!/usr/bin/env bash
+
+# Updates the SDK version in the right places.
+if [ -z "$1" ]; then
+    echo "Usage: $0 version" >&2
+    exit 1
+fi
+
+VERSION="$1"
+
+sed "s/version='[0-9.]*'/version='$VERSION'/" -i setup.py
+sed "s/__version__ = .*/__version__ = '$VERSION'/" -i pillarsdk/config.py
+
+git diff
+echo
+echo "================================================================"
+echo "Version updated to $VERSION. Don't forget to commit!"
+echo "================================================================"