Drop PHPStan until refactor

We will remove PHPStan for this version until we address larger concerns
in the code and its handling of array and ArrayAccess.

Author: rdohms

.travis.yml

@@ -11,7 +11,6 @@ before_script:
 script:
     - vendor/bin/phpunit
     - vendor/bin/phpcs
-    - vendor/bin/phpstan analyse
 
 matrix:
     allow_failures:

composer.json

@@ -15,9 +15,6 @@
     ],
     "require-dev": {
         "dms/coding-standard": "^1.0",
-        "phpstan/phpstan": "^0.11.2",
-        "phpstan/phpstan-strict-rules": "^0.11.0",
-        "phpstan/phpstan-phpunit": "^0.11.0",
         "squizlabs/php_codesniffer": "^3.4"
     },
     "autoload": {