Update nuget package version, and TFMs.

Update nuget package version, and TFMs.

build/nuget/SSH.NET.nuspec

@@ -2,7 +2,7 @@
 <package xmlns="http://schemas.microsoft.com/packaging/2011/08/nuspec.xsd">
     <metadata>
         <id>SSH.NET</id>
-        <version>2014.4.6-beta4</version>
+        <version>2016.0.0-beta2</version>
         <title>SSH.NET</title>
         <authors>Renci</authors>
         <owners>olegkap,drieseng</owners>
@@ -131,10 +131,10 @@ Fixes:
           <group targetFramework="sl5">
             <dependency id="Renci.Security.Cryptography" version="1.0.0" />
           </group>
-          <group targetFramework="wp7">
+          <group targetFramework="wp71">
             <dependency id="Renci.Security.Cryptography" version="1.0.0" />
           </group>
-          <group targetFramework="wp80">
+          <group targetFramework="wp8">
             <dependency id="Renci.Security.Cryptography" version="1.0.0" />
           </group>
           <group targetFramework="uap10.0">