Bump dependencies versions

Author: castarco

composer.json

@@ -4,14 +4,14 @@
     "type": "project",
     "license": "MIT",
     "require": {
-        "php": ">=5.5.9",
-        "composer/composer": "1.0.0-alpha11",
+        "php": ">=7.0.0",
+        "composer/composer": "^1.3.1",
         "ext-zmq": "*",
-        "monolog/monolog": "^1.9",
-        "psy/psysh": "0.7.*",
-        "ramsey/uuid": "^3.2",
+        "monolog/monolog": "^1.22",
+        "psy/psysh": "0.8.*",
+        "ramsey/uuid": "^3.5",
         "react/zmq": "^0.3.0",
-        "symfony/polyfill-php70": "^1.1"
+        "symfony/polyfill-php70": "^1.3"
     },
     "require-dev": {