docs: update alpha installation instructions (#489)

README.md

@@ -21,13 +21,13 @@ A state controller with its own debugger
 ## Try out Cerebral 2
 To try out Cerebral 2 you can install any package with:
 
-`npm install {cerebralPackage}@next --save-exact`
+`npm install {cerebralPackage}@next --save --save-exact`
 
 This will install the latest version of that package. New versions are automatically deployed whenever pull requests are merged into master.
 
 When you want to update your packages you **have to update all used packages in one go**, for example:
 
-`npm install cerebral@next cerebral-router@next cerebral-provider-http@next --save-exact`
+`npm install cerebral@next cerebral-router@next cerebral-provider-http@next --save --save-exact`
 
 ## Contribute
 The entire Cerebral codebase has been rewritten to encourage contributions. The code is cleaned up, commented and all code is in a "monorepo". That means you can run tests across projects and general management of the code is simplified a lot.