Update sample project to target .NET Framework v4.8

Author: augustoproiete

sample/SampleAddIn/App.config

@@ -1,6 +1,6 @@
-<?xml version="1.0" encoding="utf-8" ?>
+<?xml version="1.0" encoding="utf-8"?>
 <configuration>
   <startup> 
-    <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.5" />
+    <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.8"/>
   </startup>
 </configuration>

sample/SampleAddIn/SampleAddIn.csproj

@@ -9,11 +9,12 @@
     <AppDesignerFolder>Properties</AppDesignerFolder>
     <RootNamespace>SampleAddIn</RootNamespace>
     <AssemblyName>SampleAddIn</AssemblyName>
-    <TargetFrameworkVersion>v4.5</TargetFrameworkVersion>
+    <TargetFrameworkVersion>v4.8</TargetFrameworkVersion>
     <FileAlignment>512</FileAlignment>
     <Deterministic>true</Deterministic>
     <SignAssembly>true</SignAssembly>
     <AssemblyOriginatorKeyFile>..\..\assets\exceldna.snk</AssemblyOriginatorKeyFile>
+    <TargetFrameworkProfile />
   </PropertyGroup>
   <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
     <DebugSymbols>true</DebugSymbols>

sample/SampleAddIn/packages.config

@@ -1,8 +1,8 @@
 <?xml version="1.0" encoding="utf-8"?>
 <packages>
-  <package id="ExcelDna.AddIn" version="1.1.0-beta1" targetFramework="net45" developmentDependency="true" />
-  <package id="ExcelDna.Integration" version="1.1.0-beta1" targetFramework="net45" />
-  <package id="ExcelDna.XmlSchemas" version="1.0.0" targetFramework="net45" />
-  <package id="Serilog" version="2.9.0" targetFramework="net45" />
-  <package id="Serilog.Sinks.ExcelDnaLogDisplay" version="1.1.1-beta1" targetFramework="net45" />
-</packages>
+  <package id="ExcelDna.AddIn" version="1.1.0-beta1" targetFramework="net48" developmentDependency="true" />
+  <package id="ExcelDna.Integration" version="1.1.0-beta1" targetFramework="net48" />
+  <package id="ExcelDna.XmlSchemas" version="1.0.0" targetFramework="net48" />
+  <package id="Serilog" version="2.9.0" targetFramework="net48" requireReinstallation="true" />
+  <package id="Serilog.Sinks.ExcelDnaLogDisplay" version="1.1.1-beta1" targetFramework="net48" />
+</packages>