(GH-139) Upgrade supported version of Cake to 1.0.0

fixes #139

Author: AdmiringWorm

Source/Cake.Codecov.Tests/Cake.Codecov.Tests.csproj

@@ -7,7 +7,7 @@
   </PropertyGroup>
   <ItemGroup>
     <PackageReference Include="AppVeyor.TestLogger" Version="2.0.0" />
-    <PackageReference Include="Cake.Testing" Version="0.38.4" />
+    <PackageReference Include="Cake.Testing" Version="1.0.0" />
     <PackageReference Include="coverlet.msbuild" Version="2.9.0">
     <IncludeAssets>runtime; build; native; contentfiles; analyzers</IncludeAssets>
     <PrivateAssets>all</PrivateAssets>

Source/Cake.Codecov/Cake.Codecov.csproj

@@ -35,7 +35,7 @@
           <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
           <PrivateAssets>all</PrivateAssets>
         </PackageReference>
-        <PackageReference Include="Cake.Core" Version="0.33.0" PrivateAssets="All" />
+        <PackageReference Include="Cake.Core" Version="1.0.0" PrivateAssets="All" />
         <PackageReference Include="CakeContrib.Guidelines" Version="0.2.0" PrivateAssets="All" />
         <PackageReference Include="JetBrains.Annotations" Version="2020.1.0" PrivateAssets="All" />
         <PackageReference Include="Microsoft.NETFramework.ReferenceAssemblies" Version="1.0.0">