remember hardcoded master branch dependency

Also set `generate_release_notes` to true, and removed values that are set to their defaults

Author: NielsPilgaard

modpack-uploader.ps1

@@ -364,11 +364,8 @@ function New-GitHubRelease {
 
         $Body = @{
             tag_name         = $MODPACK_VERSION
-            target_commitish = 'master'
             name             = $MODPACK_VERSION
-            body             = ''
-            draft            = $false
-            prerelease       = $false
+			generate_release_notes = $true
         } | ConvertTo-Json