Add User-Agent to download requests

src/main/kotlin/link/infra/packwiz/installer/request/handlers/RequestHandlerHTTP.kt

@@ -4,6 +4,7 @@ import link.infra.packwiz.installer.metadata.SpaceSafeURI
 import link.infra.packwiz.installer.request.IRequestHandler
 import okio.Source
 import okio.source
+import java.net.HttpURLConnection
 
 open class RequestHandlerHTTP : IRequestHandler {
 	override fun matchesHandler(loc: SpaceSafeURI): Boolean {
@@ -12,14 +13,17 @@ open class RequestHandlerHTTP : IRequestHandler {
 	}
 
 	override fun getFileSource(loc: SpaceSafeURI): Source? {
-		val conn = loc.toURL().openConnection()
+		val conn = loc.toURL().openConnection() as HttpURLConnection
 		// TODO: when do we send specific headers??? should there be a way to signal this?
-		// github *sometimes* requires it, sometimes not!
-		//conn.addRequestProperty("Accept", "application/octet-stream");
+		conn.addRequestProperty("Accept", "application/octet-stream")
+		// TODO: include version?
+		conn.addRequestProperty("User-Agent", "packwiz-installer")
+
 		conn.apply {
 			// 30 second read timeout
 			readTimeout = 30 * 1000
+			requestMethod = "GET"
 		}
-		return conn.getInputStream().source()
+		return conn.inputStream.source()
 	}
 }