larger default width for sake of legibility

main.go

@@ -24,7 +24,7 @@ import (
 const (
 	defaultListen  = ":3333"
 	defaultDir     = "./images"
-	defaultWidth   = 80
+	defaultWidth   = 130
 	cacheSuffixFmt = ".ansi.%d.txt"
 	allowedUA      = "curl"
 	maxImageDim    = 2000
@@ -123,7 +123,7 @@ func rootHandler(w http.ResponseWriter, r *http.Request) {
 	}
 	defer f.Close()
 
-	w.Header().Set("Content-Type", "text/plain; charset=utf-8")
+	w.Header().Set("Content-Type", "text/plain; charset=utf8")
 	w.WriteHeader(http.StatusOK)
 	if _, err := io.Copy(w, f); err != nil {
 		log.Printf("write error: %v", err)