(GH-523) Pin to specific version of coveralls

The coveralls.net NuGet package is being used for both the full .net
framework version and the .Net Global tool version.  Pin to 0.7.0 for
the latest .Net framework version (which will mean it will run on Unix
systems) and also update to latest Cake.Coveralls addin which includes
a fix for a case sensitive issue.

Cake.Recipe/Content/addins.cake

@@ -3,7 +3,7 @@
 ///////////////////////////////////////////////////////////////////////////////
 
 #addin nuget:?package=Cake.Codecov&version=0.8.0
-#addin nuget:?package=Cake.Coveralls&version=0.10.1
+#addin nuget:?package=Cake.Coveralls&version=0.10.2
 #addin nuget:?package=Cake.Coverlet&version=2.4.2
 #addin nuget:?package=Cake.Email&version=0.9.2&loaddependencies=true // loading dependencies is important to ensure Cake.Email.Common is loaded as well
 #addin nuget:?package=Cake.Figlet&version=1.3.1

Cake.Recipe/Content/toolsettings.cake

@@ -41,7 +41,7 @@ public static class ToolSettings
 
     public static void SetToolPreprocessorDirectives(
         string codecovTool = "#tool nuget:?package=codecov&version=1.12.0",
-        string coverallsTool = "#tool nuget:?package=coveralls.net&version=1.0.0",
+        string coverallsTool = "#tool nuget:?package=coveralls.net&version=0.7.0",
         string gitReleaseManagerTool = "#tool nuget:?package=GitReleaseManager&version=0.11.0",
         string gitVersionTool = "#tool nuget:?package=GitVersion.CommandLine&version=5.0.1",
         string reSharperTools = "#tool nuget:?package=JetBrains.ReSharper.CommandLineTools&version=2019.3.4",