chore: remove snk from git

[skip ci]

Author: doghappy

src/SocketIOClient.Windows7/SocketIOClient.Windows7.csproj

@@ -10,8 +10,6 @@
     <RepositoryUrl>https://github.com/doghappy/socket.io-client-csharp</RepositoryUrl>
     <RepositoryType>github</RepositoryType>
     <PackageTags>socket.io-client</PackageTags>
-    <SignAssembly>true</SignAssembly>
-    <AssemblyOriginatorKeyFile>SocketIOClient.snk</AssemblyOriginatorKeyFile>
   </PropertyGroup>
 
   <ItemGroup>

src/SocketIOClient.Windows7/SocketIOClient.snk

@@ -16,8 +16,7 @@
     <Version>2.2.4</Version>
     <PackageReleaseNotes></PackageReleaseNotes>
     <PackageLicenseExpression>MIT</PackageLicenseExpression>
-    <SignAssembly>true</SignAssembly>
-    <AssemblyOriginatorKeyFile>SocketIOClient.snk</AssemblyOriginatorKeyFile>
+    <SignAssembly>false</SignAssembly>
   </PropertyGroup>
 
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|AnyCPU'">