Set rpmbuild spec to require stomppy < 4

- Set requirement for stomppy < 4.0.0 in rpmbuild spec file as versions >=
  4.0.0 are currently incompatible with SSM (proplem raised by a SUSE
  user). The versions of stomppy currently available in all the EPEL
  repositories are no greater than 3.1.6.
Bump version number for test build

[ci skip]
Change README to README.md in spec file

- Change README to README.md in spec file as the name of the readme file
  was changed.

[ci skip]
Bump version number for second test build

[ci skip]
Merge pull request #8 from apel/stomppy-v4

Stomppy v4