Fixing version of nuget packages

This version and the dependencies are now consistent with what is on
Nuget.

Author: PawelMaj

Build/NuGet/HtmlRenderer.Mono.nuspec

@@ -39,7 +39,7 @@
       <frameworkAssembly assemblyName="System.Drawing" targetFramework="" />
     </frameworkAssemblies>
     <dependencies>
-      <dependency id="HtmlRenderer.Core" version="1.5.1"/>
+      <dependency id="HtmlRenderer.Core" version="1.5.1-beta1"/>
     </dependencies>
   </metadata>
   <files>

Build/NuGet/HtmlRenderer.PdfSharp.nuspec

@@ -34,7 +34,7 @@
       <frameworkAssembly assemblyName="System.Drawing" targetFramework="" />
     </frameworkAssemblies>
     <dependencies>
-      <dependency id="HtmlRenderer.Core" version="1.5.1"/>
+      <dependency id="HtmlRenderer.Core" version="1.5.1-beta1"/>
       <dependency id="PDFsharp" version="1.50.4000-beta3b"/>
     </dependencies>
   </metadata>

Build/NuGet/HtmlRenderer.WPF.nuspec

@@ -39,7 +39,7 @@
       <frameworkAssembly assemblyName="System.Drawing" targetFramework="" />
     </frameworkAssemblies>
     <dependencies>
-      <dependency id="HtmlRenderer.Core" version="1.5.1"/>
+      <dependency id="HtmlRenderer.Core" version="1.5.1-beta1"/>
     </dependencies>
   </metadata>
   <files>

Build/NuGet/HtmlRenderer.WinForms.nuspec

@@ -39,7 +39,7 @@
       <frameworkAssembly assemblyName="System.Drawing" targetFramework="" />
     </frameworkAssemblies>
     <dependencies>
-      <dependency id="HtmlRenderer.Core" version="1.5.1"/>
+      <dependency id="HtmlRenderer.Core" version="1.5.1-beta1"/>
     </dependencies>
   </metadata>
   <files>