fix dos line endings (grumble @ MSFT tooling)

2020/AdventOfCode.csproj

@@ -1,14 +1,14 @@
-<Project Sdk="Microsoft.NET.Sdk">
-
-  <PropertyGroup>
-    <OutputType>Exe</OutputType>
-    <TargetFramework>net5.0</TargetFramework>
-    <GenerateProgramFile>false</GenerateProgramFile>
-  </PropertyGroup>
-
-  <ItemGroup>
-    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="15.9.0" />
-    <PackageReference Include="xunit" Version="2.4.1" />
-    <PackageReference Include="xunit.runner.visualstudio" Version="2.4.1" />
-  </ItemGroup>
-</Project>
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net5.0</TargetFramework>
+    <GenerateProgramFile>false</GenerateProgramFile>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="15.9.0" />
+    <PackageReference Include="xunit" Version="2.4.1" />
+    <PackageReference Include="xunit.runner.visualstudio" Version="2.4.1" />
+  </ItemGroup>
+</Project>

2020/Program.cs

@@ -1,23 +1,23 @@
-using System;
-using static System.Console;
-using System.Collections.Generic;
-using Xunit;
-
-namespace AdventOfCode {
-
-  public class Program {
-
-    static string Hello() {
-      return "ahoy, world";
-    }
-
-    [Fact]
-    static void HelloTest() {
-      Assert.Equal("ahoy, world", Hello());
-    }
-
-    static void Main(string[] args) {
-      Console.WriteLine(Hello());
-    }
-  }
-}
+using System;
+using static System.Console;
+using System.Collections.Generic;
+using Xunit;
+
+namespace AdventOfCode {
+
+  public class Program {
+
+    static string Hello() {
+      return "ahoy, world";
+    }
+
+    [Fact]
+    static void HelloTest() {
+      Assert.Equal("ahoy, world", Hello());
+    }
+
+    static void Main(string[] args) {
+      Console.WriteLine(Hello());
+    }
+  }
+}