composer.json: Relax all version constraints..

..to the latest major or the major that still supports
PHP 5.6.

composer.json

@@ -17,30 +17,30 @@
         "php": ">=5.6.3",
         "ext-curl": "*",
         "clue/block-react": "^1",
-        "clue/connection-manager-extra": "^1.1",
+        "clue/connection-manager-extra": "^1",
         "clue/http-proxy-react": "^1",
-        "clue/mq-react": "^1.1",
-        "clue/redis-react": "^2.3",
-        "clue/soap-react": "^1.0",
-        "clue/socket-raw": "^1.4",
+        "clue/mq-react": "^1",
+        "clue/redis-react": "^2",
+        "clue/soap-react": "^1",
+        "clue/socket-raw": "^1",
         "clue/socks-react": "^1",
-        "clue/stdio-react": "^2.3",
+        "clue/stdio-react": "^2",
         "evenement/evenement": "^2",
-        "predis/predis": "^1.1",
+        "predis/predis": "^1",
         "psr/http-message": "^1",
-        "ramsey/uuid": "^3.8",
+        "ramsey/uuid": "^3",
         "react/child-process": "^0.6",
-        "react/datagram": "^1.5",
+        "react/datagram": "^1",
         "react/dns": "^1",
-        "react/event-loop": "^1.1",
+        "react/event-loop": "^1",
         "react/http": "^1",
         "react/promise": "^2",
         "react/promise-stream": "^1",
-        "react/promise-timer": "^1.5",
+        "react/promise-timer": "^1",
         "react/socket": "^1",
-        "react/stream": "^1.1",
-        "guzzlehttp/psr7": "^1.7",
-        "guzzlehttp/guzzle": "^6.5.5"
+        "react/stream": "^1",
+        "guzzlehttp/psr7": "^1",
+        "guzzlehttp/guzzle": "^6.5"
     },
     "require-dev": {
     }