upload to pypi fails due to Readme rendering issues

[cehbrecht]

Description

Upload with twine to pypi of 4.2.4 fails:

twine check dist/pywps-4.2.4.tar.gz 
Checking dist/pywps-4.2.4.tar.gz: FAILED
  `long_description` has syntax errors in markup and would not be rendered on PyPI.
    line 54: Warning: Inline literal start-string without end-string.
  warning: `long_description_content_type` missing.  defaulting to `text/x-rst`.

Maybe we should add this check to travis CI.

Environment

• operating system:
• Python version:
• PyWPS version: 4.2.4
• source/distribution
• git clone
• Debian
• PyPI
• zip/tar.gz
• other (please specify):
• web server
• Apache/mod_wsgi
• CGI
• other (please specify):

Steps to Reproduce

Additional Information

[cehbrecht]

fixed by #534.