Add artificial delay if spam is detected or the captcha is wrong.

src/main.cpp

@@ -28,11 +28,13 @@
 #include <cstdlib>
 #include <exception>
 #include <iostream>
+#include <thread>
 
 using std::cerr;
 using std::cout;
 using std::exception;
 using std::getenv;
+using namespace std::chrono_literals;
 
 using namespace FediBlock;
 
@@ -82,11 +84,13 @@ int main()
     catch (const SpamException &e)
     {
         cerr << e.what() << '\n';
+        std::this_thread::sleep_for(10s);
         cout << e.what() << "\r\n";
     }
     catch (const CaptchaException &e)
     {
         cerr << e.what() << '\n';
+        std::this_thread::sleep_for(5s);
         cout << e.what() << "\r\n"
              << "Use the back button of your browser to try again.\r\n";
     }