Update dotnet-bot sample for .NET Core 2.1 (#2409)

samples/dotnetbot/README.md

@@ -1,10 +1,8 @@
-dotnet-bot Sample
-================
+# dotnet-bot Sample
 
 The dotnet-bot sample demonstrates "hello world" type usage of .NET Core. It displays [dotnet-bot](https://github.com/dotnet-bot), the open source mascot for .NET Core projects. This sample is very similar to the Docker [whalesay](https://docs.docker.com/engine/getstarted/step_three/) sample.
 
-Topics
-------
+## Topics
 
 You will exercise the following topics in this sample.
 
@@ -12,30 +10,28 @@ You will exercise the following topics in this sample.
 - Creating a Docker image for a .NET Core application.
 - Running a .NET Core application in container.
 
-Script
-------
+## Script
 
 Follow these steps to try out this sample. The instructions are intended to be Operating System agnostic, unless called out. 
 
 **Preparing your Environment**
 
-1. Install the [.NET Core SDK](https://dot.net/core) for your operating system.
+1. Install the [.NET Core SDK](https://dot.net/core) (2.1 or higher) for your operating system.
 2. Git clone this repository or otherwise copy this sample to your machine: `git clone https://github.com/dotnet/core/`
 3. Navigate to the sample on your machine at the command prompt or terminal.
 
 **Run the application**
 
-4. Restore dependencies: `dotnet restore`
-5. Run application: `dotnet run`
-6. Alternatively, you can build and directly run your application with the following two commands:
+4. Run application: `dotnet run`
+5. Alternatively, you can build and directly run your application with the following two commands:
    - `dotnet build`
-   - `dotnet bin/Debug/netcoreapp1.0/dotnetbot.dll`
-7. You can also try passing input to the sample to get the dotnet-bot to say something: `dotnet run dotnet-bot is a great teacher`
+   - `dotnet bin/Debug/netcoreapp2.1/dotnetbot.dll`
+6. You can also try passing input to the sample to get the dotnet-bot to say something: `dotnet run dotnet-bot is a great teacher`
 
 **Dockerize the application**
 
 The Docker instructions are OS agnostic, however, the Dockerfile used relies on a Linux image.
 
-8. Install the [Docker tools](https://www.docker.com/products/docker) for your operating system.
-9. Build a Docker container, as specified by the [Dockerfile](Dockerfile): `docker build -t dotnetbot .`
-10. Run the application in the container: `docker run dotnetbot Hello .NET Core from Docker`
+7. Install the [Docker tools](https://www.docker.com/products/docker) for your operating system.
+8. Build a Docker container, as specified by the [Dockerfile](Dockerfile): `docker build -t dotnetbot .`
+9. Run the application in the container: `docker run dotnetbot Hello .NET Core from Docker`