set cURL timeout to 3s

hey..... versions.json is currently 374 bytes, so it's enough for you, right?

src/lib/misc.c

@@ -86,6 +86,7 @@ _Bool checkVersion()
     //GET versions.json
     curl_easy_setopt(curl, CURLOPT_URL, VERSIONS_URL);
     curl_easy_setopt(curl, CURLOPT_WRITEDATA, fileBuffer);
+    curl_easy_setopt(curl, CURLOPT_TIMEOUT, 3);
 
     //DOWNLOAD versions.json
     curl_easy_perform(curl);