Update go-parser.psm1

get-new-tool-versions/parsers/go-parser.psm1

@@ -15,10 +15,15 @@ class GoVersionsParser: BaseVersionsParser {
 
     hidden [SemVer] FormatVersion([string]$VersionSpec) {
         $cleanVersion = $VersionSpec -replace "^go", ""
-        return [SemVer]$cleanVersion
+        $semanticVersion = $cleanVersion -replace "(\d+\.\d+\.?\d+?)((?:alpha|beta|rc))(\d*)",'$1-$2.$3'
+        return [SemVer]$semanticVersion
     }
 
     hidden [bool] ShouldIncludeVersion([SemVer]$Version) {
+        if ($Version.PreReleaseLabel) {
+            return $false
+        }
+
         # For Go, we include all versions greater than 1.12
         return $Version -gt [SemVer]"1.12.0"
     }