Add missing bracket in API request example

README.md

@@ -23,7 +23,7 @@ const res = await fetch("https://libretranslate.com/translate", {
 		target: "es"
 	}),
 	headers: {
-		"Content-Type": "application/json"
+		"Content-Type": "application/json"}
 	});
 
 console.log(await res.json());

app/templates/index.html

@@ -345,7 +345,7 @@ document.addEventListener('DOMContentLoaded', function(){
 '		target: "' + this.$options.filters.escape(this.targetLang) + '"',
 '	}),',
 '	headers: {',
-'		"Content-Type": "application/json"',
+'		"Content-Type": "application/json"}',
 '	});',
 '',
 'console.log(await res.json());'].join("\n");