update to support newer Laravel versions

Merge pull request #9 from vladyslavstartsev/update-and-prettyfy

updated package

Laravel 5.6 compatibility update

Mitigate null charset from foundation
bump php version and zend diactoros versions

v1.7.1

README update

PSR-15 Approved - updated dependencies/namespaces

v1.7

Update namespaces for PSR-15 approval. Update README. Update Dependen…

Added Middleware Types & Priorities - Breaking Change

v1.6

README update, dispatcher request changes

v1.5.3

update handler to properly carry cloned request objects

v1.5.2

more README tweaks

v1.5.1

minor test changes and README updates

v1.5

added per element update of foudnatio headers

v1.4

replace pushmiddleware with prependmiddleware where used