minor #871 Added phpstan (clxkoders)

This PR was squashed before being merged into the 2.14.x-dev branch.

Discussion
----------

closes #857

Commits
-------

452ef72 Update .travis.yml
a59e75e added phpstan
a77c885 added phpstan-baseline
e395c86 reset phpstan level to 0
2f9e507 Update .travis.yml
53d52c7 remove phpstan baseline
f90467e remove phpstan baseline

Author: clxkoders

.travis.yml

@@ -21,6 +21,10 @@ matrix:
     - php: 7.2
       name: Backward compatibillity check
       env: DEPENDENCIES="roave/backward-compatibility-check" TEST_COMMAND="./.github/bc-test.sh"
+    - php: 7.1
+      name: phpstan
+      script:
+        - vendor/bin/phpstan analyse --no-progress
 
 before_install:
     - if ! [ -z "$DEPENDENCIES" ]; then composer require --no-update ${DEPENDENCIES}; fi;

composer.json

@@ -31,7 +31,8 @@
         "php-http/guzzle6-adapter": "^1.0 || ^2.0",
         "php-http/mock-client": "^1.2",
         "guzzlehttp/psr7": "^1.2",
-        "cache/array-adapter": "^0.4"
+        "cache/array-adapter": "^0.4",
+        "phpstan/phpstan": "^0.12.23"
     },
     "autoload": {
         "psr-4": { "Github\\": "lib/Github/" }

phpstan.neon.dist

@@ -0,0 +1,4 @@
+parameters:
+	level: 0
+	paths:
+		- lib