Fix nuspec file
Fix nuspec file

So it turns out our nuspec was broken, and we didn't know it...

fraga/libsodium-net,BurningEnlightenment/libsodium-net,bitbeans/libsodium-net,bitbeans/libsodium-net,adamcaudill/libsodium-net,tabrath/libsodium-core,fraga/libsodium-net,deckar01/libsodium-net,adamcaudill/libsodium-net,deckar01/libsodium-net,BurningEnlightenment/libsodium-net