Warmup example in README seems to be using non-existent features

[schrepfler]

Having issues with the warmup code from the README even after importing finatra-utils and finatra-httpclient.

[cacoco]

Can you give more detail to the issues you're having including any errors or stacktraces you're getting? Thanks!

[schrepfler]

It simply did not compile but in the end it's the same problem as my previous issue, missing function which are implemented in the subsequent code commits.