Merge pull request #57 from tuupola/slim-version

Relax minimum required version of Slim

Author: sagikazarmark

composer.json

@@ -24,7 +24,7 @@
  "henrikbjorn/phpspec-code-coverage" : "^1.0",
  "coduo/phpspec-data-provider-extension": "^1.0",
  "akeneo/phpspec-skip-example-extension": "^1.0",
- "slim/slim": "^3.5"
+ "slim/slim": "^3.0"
  },
  "suggest": {
  "zendframework/zend-diactoros": "Used with Diactoros Factories",