Fix .NET 4.5 project to target .NET 4.5 instead of 4.6.

Author: drieseng

src/SshNet.Security.Cryptography.NET45/SshNet.Security.Cryptography.NET45.csproj

@@ -9,8 +9,9 @@
     <AppDesignerFolder>Properties</AppDesignerFolder>
     <RootNamespace>SshNet.Security.Cryptography</RootNamespace>
     <AssemblyName>SshNet.Security.Cryptography</AssemblyName>
-    <TargetFrameworkVersion>v4.6</TargetFrameworkVersion>
+    <TargetFrameworkVersion>v4.5</TargetFrameworkVersion>
     <FileAlignment>512</FileAlignment>
+    <TargetFrameworkProfile />
   </PropertyGroup>
   <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
     <DebugSymbols>true</DebugSymbols>