Merge pull request #27 from homiedopie/feature/psr-log-2-3

Add PSR Log 2 and 3 for monolog support

Author: homiedopie

composer.json

@@ -7,7 +7,7 @@
     "license": "Apache-2.0",
     "require": {
         "php": ">=5.3.0",
-        "psr/log": "~1.0",
+        "psr/log": "^1.0 | ^2.0 | ^3.0",
         "guzzlehttp/psr7": "^1.6",
         "php-http/socket-client": "^1.4 | ^2.0",
         "php-http/message": "^1.7"