BUG: romb print output requires correction

[jankoslavic]

The option show=True results into a wrongly formatted output

Reproducing code example:

x9v, h9v = np.linspace(1, 2, 9, retstep=True)  # korak h9v = 0.125 (9 vozlišč)
y9v = x9v * np.sin(x9v)
romb(y9v, dx=h9v, show=True)

See figure:

Scipy/Numpy/Python version information:

1.0.0 1.13.3 sys.version_info(major=3, minor=6, micro=3, releaselevel='final', serial=0)

[Tokixix]

@ilayn I know how to solve it(adding "\n" in one place ;p). Can I PR this?

[ilayn]

@Tokixix Sure, if there is noone explicitly claimed to work on it, you can freely pick up on any issue. Make sure to create a new branch though 😃

Also if you place one of these words in your PR description, then your PR will close this issue once merged. For example, I've just edited #8296 description to link to the issue.

[Tokixix]

@ilayn Will do, thanks!