[LTP] [PATCH] README: Add note about testing with Travis CI

[Petr Vorel]

Hi Cyril,

> Maybe we should explain why this is a good idea, something as:

> It's a good idea to test patches on Travis CI before posting to mailing
> list. Our travis setup covers various architectures and distributions in
> order to make sure LTP compiles cleanly on most common configurations.
Thanks, good idea. Acking this?

+
+It's a good idea to test patches on Travis CI before posting to mailing
+list. Our travis setup covers various architectures and distributions in
+order to make sure LTP compiles cleanly on most common configurations.
+For testing you need to sign up to Travis CI, enable running builds on your LTP fork on
+https://travis-ci.org/account/repositories and push your branch.


Kind regards,
Petr