tests/test_monitor.cpp has no newline at EOF (causes compile error)

[gfim]

The source file tests/test_monitor.cpp doesn't have a newline as its last character. This causes a compilation warning. Since -Werror is the default, that causes an error.

[Pieter Hintjens]

Can you raise an issue in Jira (not here), and then make a pull request with this fix?

Thanks!