Typo + support php 5.6

Author: nmc

README.md

@@ -8,7 +8,7 @@ Mikrotik-Watch will :
 - Process each bidirectional transfer to get metrics for each internal IP (Within specified range)
 - Push or display data. 
 
-Currently push to inflxudb directly, but plan are to output data for telegraf ingestion or display in a simple webpage.
+Currently push to inflxudb directly, but plans are to output data for telegraf ingestion or display in a simple webpage.
 
 ![Grafana Example](https://github.com/ncareau/mikro-watch/raw/master/demo/panel.PNG)
 

composer.json

@@ -10,9 +10,12 @@
         }
     ],
     "require": {
+        "php": ">=5.6",
         "symfony/console": "^3.4",
+        "symfony/debug": "^3.4",
         "symfony/var-dumper": "^3.4",
         "symfony/dotenv": "^3.4",
+        "symfony/event-dispatcher": "^3.4",
         "guzzlehttp/guzzle": "^6.3",
         "s1lentium/iptools": "^1.1",
         "influxdb/influxdb-php": "^1.14",