Major Release v.1.0.0

This is the first major release of PySwarms. Starting today, we will be adhering to a better semantic versioning guidelines. We will be updating the project wikis shortly after. The maintainers believe that PySwarms is mature enough to merit a version 1, this would also help us release more often (mostly minor releases) and create patch releases as soon as possible.

Also, we will be maintaining a quarterly release cycle, where the next minor release (v.1.1.0) will be on June. All enhancements and new features will be staged on the development branch, then will be merged back to the master branch at the end of the cycle. However, bug fixes and documentation errors will merit a patch release, and will be merged to master immediately.

• NEW: Boundary and velocity handlers to resolve stuck particles - #238 . All thanks for our maintainer, @whzup !
• FIX: Duplication function calls during optimization, hopefully your long-running objective functions won't take doubly long. - #266. Thank you @danielcorreia96 !