Pin CLI to 1.0.0.001425 and update readme

.travis.yml

@@ -9,7 +9,7 @@ before_install:
   - sudo sh -c 'echo "deb [arch=amd64] http://apt-mo.trafficmanager.net/repos/dotnet/ trusty main" > /etc/apt/sources.list.d/dotnetdev.list'
   - sudo apt-key adv --keyserver apt-mo.trafficmanager.net --recv-keys 417A0893
   - sudo apt-get -qq update
-  - sudo apt-get install -y dotnet-nightly=1.0.1.001252-1
+  - sudo apt-get install -y dotnet=1.0.0.001425-1
 script:
   - dotnet restore
   - ./build.sh

README.md

@@ -57,8 +57,19 @@ We use the [.NET Command Line Interface][dotnet-cli] (`dotnet-cli`) to build
 the managed components, and [CMake][] to build the native components (on
 non-Windows platforms). Install `dotnet-cli` by following their [documentation][].
 
-**Make sure to `apt-get install dotnet-nightly=1.0.1.001252-1` for a known,
-good version.**
+The version of .NET CLI is very important, you want a recent 1.0.0 beta
+(**not** 1.0.1).
+
+These are known good versions:
+
+```sh
+sudo apt-get install dotnet=1.0.0.001425-1
+```
+
+```powershell
+Invoke-WebRequest -Uri https://raw.githubusercontent.com/dotnet/cli/rel/1.0.0/scripts/obtain/install.ps1 -OutFile install.ps1
+./install.ps1 -version 1.0.0.001425 -channel beta
+```
 
 > Note that OS X dependency installation instructions are not yet documented,
 > and Core PowerShell on Windows only needs `dotnet-cli`.

appveyor.yml

@@ -15,7 +15,7 @@ install:
   - git config --global url.git@github.com:.insteadOf https://github.com/
   - git submodule update --init --recursive -- src/monad src/windows-build src/Microsoft.PowerShell.Linux.Host/Modules/Pester
   - ps: Invoke-WebRequest -Uri https://raw.githubusercontent.com/dotnet/cli/rel/1.0.0/scripts/obtain/install.ps1 -OutFile install.ps1
-  - ps: ./install.ps1 -version "1.0.1.001186"
+  - ps: ./install.ps1 -version 1.0.0.001425 -channel beta
 
 build_script:
   - ps: $env:Path += ";$env:LocalAppData\Microsoft\dotnet\cli\bin"