Update contribute.md

docs-src/docs/contribute.md

@@ -18,11 +18,7 @@ Before you can start developing, do the following:
 1. Make sure you have installed nodejs with the version stated in the [.nvmrc](https://github.com/pubkey/rxdb/blob/master/.nvmrc)
 2. Clone the repository `git clone https://github.com/pubkey/rxdb.git`
 3. Install the dependencies `cd rxdb && npm install`
-4. Make sure that the tests work for you `npm run test`
-
-## Flow
-
-While developing you should run `npm run dev` and leave it open in the console. This will run the unit-tests on every file-change. If you have a slow device, you can also manually run `npm run test:node` every time you want to check if the tests work.
+4. Make sure that the tests work for you. At first, try it out with `npm run test:node:memory` which tests the memory storage in node. In the package.json you can find more scripts to run the tests with different storages.
 
 ## Adding tests