Update process to not set deps to #develop

Update README instructions and add checks to release script to
prevent us forgetting to bump the versions of dependencies
(because the check in the main release script will only catch
references to #develop left in, which will no longer be the
failure mode).

release.sh

@@ -9,6 +9,22 @@ set -e
 
 cd `dirname $0`
 
+for i in matrix-js-sdk matrix-react-sdk
+do
+    depver=`cat package.json | jq -r .dependencies.\"$i\"`
+    latestver=`npm show $i version`
+    if [ "$depver" != "$latestver" ]
+    then
+        echo "The latest version of $i is $latestver but package.json depends on $depver"
+        echo -n "Type 'Yes' to continue anyway: "
+        read resp
+        if [ "$resp" != "Yes" ]
+        then
+            echo "OK, never mind."
+            exit 1
+        fi
+    fi
+done
 
 # bump Electron's package.json first
 release="${1#v}"