Improve development setup section of README.md file

README.md

@@ -57,11 +57,12 @@ This will start the webserver on port 4000, migrate the database to have an up a
 
 ## 🚧 Requirements
 
-- `erlang ~> 21.2`
-- `elixir ~> 1.9`
+- `erlang ~> 23.1`
+- `elixir ~> 1.11`
 - `postgres >= 9.4`
 - `node.js >= 10.16.0`
 - `libyaml >= 0.1.7`
+- `gleam ~> 0.11`
 
 ## 🎛 Executing mix commands
 
@@ -92,9 +93,8 @@ _This is the full development setup. To simply run the app, see the *Getting sta
 5. Install dependencies with `make dependencies`
 6. Create and migrate your database with `mix ecto.setup`
 7. Start Phoenix endpoint with `mix phx.server`
-8. Start Ember server with `npm run start --prefix webapp`
 
-_That’s it!_
+_That’s it!_ You should now be able to open the app at `http://localhost:4000`
 
 ### Makefile