Definitive fix for nuspec format

Author: josesimoes

nanoFramework.MessagePack.nuspec

@@ -18,7 +18,7 @@
     <description>This library allows to serialize and deserialize object graphs in .NET nanoFramework. MessagePack is an object serialization specification like JSON.</description>
     <tags>messagepack net nf nanoframework</tags>
     <dependencies>
-      <group targetFramework="netnano">
+      <group targetFramework="netnano1.0">
        <dependency id="nanoFramework.CoreLibrary" version="1.17.11" />
        <dependency id="nanoFramework.System.Collections" version="1.5.67" />
        <dependency id="nanoFramework.System.IO.Streams" version="1.1.94" />
@@ -27,7 +27,7 @@
     </dependencies>
   </metadata>
   <files>
-    <file src="nanoFramework.MessagePack\bin\Release\nanoFramework.MessagePack.*" target="lib\netnano\*" />
+    <file src="nanoFramework.MessagePack\bin\Release\nanoFramework.MessagePack.*" target="lib\netnano1.0" />
     <file src="assets\readme.txt" target="" />
     <file src="README.md" target="docs\" />
     <file src="assets\nf-logo.png" target="images" />