add ./vendor to excluded directories by default

small chance this is used by non-Go projects, let me know if that is the case

Author: tj

internal/zip/zip.go

@@ -35,7 +35,7 @@ func Build(dir string) (io.ReadCloser, *archive.Stats, error) {
 
 	r := io.MultiReader(
 		strings.NewReader(".*\n"),
-		strings.NewReader("\n!node_modules/**\n!.pypath/**\n"),
+		strings.NewReader("\n!vendor\n!node_modules/**\n!.pypath/**\n"),
 		upignore,
 		strings.NewReader("\n!main\n!server\n!_proxy.js\n!byline.js\n!up.json\n!pom.xml\n!build.gradle\n!project.clj\ngin-bin\nup\n"))