Fix the warnings of the static analyzer

Author: cedx

src/Main.psm1

@@ -1,3 +1,4 @@
+using namespace System.Diagnostics.CodeAnalysis
 using module ./Platform.psm1
 using module ./Release.psm1
 using module ./Setup.psm1
@@ -95,6 +96,7 @@ function Install-Release {
 #>
 function New-Release {
 	[OutputType([Release])]
+	[SuppressMessage("PSUseShouldProcessForStateChangingFunctions", "")]
 	param (
 		[Parameter(Mandatory, Position = 0, ValueFromPipeline)]
 		[ValidateNotNullOrWhiteSpace()]
@@ -122,6 +124,7 @@ function New-Release {
 #>
 function New-ReleaseAsset {
 	[OutputType([ReleaseAsset])]
+	[SuppressMessage("PSUseShouldProcessForStateChangingFunctions", "")]
 	param (
 		[Parameter(Mandatory, Position = 0)]
 		[ValidateNotNull()]

src/Platform.psm1

@@ -1,5 +1,3 @@
-using namespace System.Diagnostics.CodeAnalysis
-
 <#
 .SYNOPSIS
 	Identifies an operating system or platform.
@@ -18,10 +16,9 @@ enum Platform {
 #>
 function Get-Platform {
 	[OutputType([Platform])]
-	[SuppressMessage("PSUseDeclaredVarsMoreThanAssignments", "")]
 	param ()
 
-	return $discard = switch ($true) {
+	switch ($true) {
 		{ $IsLinux } { [Platform]::Linux; break }
 		{ $IsMacOS } { [Platform]::MacOS; break }
 		default { [Platform]::Windows }