Merge pull request algolia/vue-instantsearch#9 from algolia/fix/readme

add highlighting to readme code block

packages/vue-instantsearch/README.md

@@ -5,7 +5,7 @@ This project uses [Lerna](https://github.com/lerna/lerna) to orchestrate the all
 
 To get started you should:
 
-```
+```sh
 # Install Lerna globally
 yarn global add lerna
 
@@ -24,7 +24,7 @@ lerna run build
 Sometimes your builds will fail because of incorrect dependencies resolution. If that happens, the easiest fix is
 to delete all `node_modules` folders and to bootstrap again.
 
-```
+```sh
 rm -rf ./packages/*/node_modules
 lerna bootstrap
 ```