added user agent: OpenSpace, to http-request

src/engine/downloadmanager.cpp

@@ -243,7 +243,7 @@ std::future<DownloadManager::MemoryFile> DownloadManager::fetchFile(
 
         curl_easy_setopt(curl, CURLOPT_URL, url.c_str()); // NOLINT
         curl_easy_setopt(curl, CURLOPT_FOLLOWLOCATION, 1L); // NOLINT
-        // NOLINTNEXTLINE
+        curl_easy_setopt(curl, CURLOPT_USERAGENT, "OpenSpace"); // NOLINT
         curl_easy_setopt(curl, CURLOPT_WRITEDATA, reinterpret_cast<void*>(&file));
         curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, writeMemoryCallback); // NOLINT
         curl_easy_setopt(curl, CURLOPT_TIMEOUT, 5L); // NOLINT

src/util/httprequest.cpp

@@ -58,6 +58,7 @@ bool HttpRequest::perform(std::chrono::milliseconds timeout) {
     }
 
     curl_easy_setopt(curl, CURLOPT_URL, _url.data());
+    curl_easy_setopt(curl, CURLOPT_USERAGENT, "OpenSpace"); // NOLINT
     curl_easy_setopt(curl, CURLOPT_FOLLOWLOCATION, 1L);
 
     // The leading + in all of the lambda expressions are to cause an implicit conversion