Fix whitespace issues

Ix.NET/Source/NuSpecs/System.Interactive.Async.Providers.nuspec

@@ -30,7 +30,7 @@
       </group>
       <group targetFramework="net45">
         <dependency id="System.Interactive.Async" version="$version$" />
-      </group>      
+      </group>
     </dependencies>
     <frameworkAssemblies>
       <frameworkAssembly assemblyName="System" targetFramework="net45" />

Ix.NET/Source/NuSpecs/System.Interactive.nuspec

@@ -17,7 +17,7 @@
       <frameworkAssembly assemblyName="System" targetFramework="net45" />
       <frameworkAssembly assemblyName="System.Core" targetFramework="net45" />
     </frameworkAssemblies>
-    <dependencies>      
+    <dependencies>
       <group targetFramework="netstandard1.0">
         <dependency id="System.Collections" version="4.0.11" />
         <dependency id="System.Diagnostics.Debug" version="4.0.11" />