Merge commit 'd2b7ee2575c5132ef050e2523955382e1fae00ec' as 'bridges'

(git subtree add --prefix=bridges bridges master --squash)

bridges/scripts/update_substrate.sh

@@ -0,0 +1,10 @@
+#!/bin/sh
+
+# One-liner to update between Substrate releases
+# Usage: ./update_substrate.sh 2.0.0-rc6 2.0.0
+set -xeu
+
+OLD_VERSION=$1
+NEW_VERSION=$2
+
+find . -type f -name 'Cargo.toml' -exec sed -i '' -e "s/$OLD_VERSION/$NEW_VERSION/g" {} \;