npm install the js-sdk

scripts/travis.sh

@@ -6,6 +6,10 @@ scripts/fetchdep.sh matrix-org matrix-js-sdk
 rm -r node_modules/matrix-js-sdk || true
 ln -s matrix-js-sdk node_modules/matrix-js-sdk
 
+pushd node_modules/matrix-js-sdk
+npm install
+popd
+
 npm run test
 ./.travis-test-riot.sh