Update composer config

Author: aksalj

composer.json

@@ -7,23 +7,8 @@
     "license": "MIT",
     "authors": [
         {
-            "name": "Stephen Afam-Osemene",
-            "email": "s.afamo@africastalking.com",
-            "homepage": "https://www.africastalking.com"
-        },
-        {
-            "name": "Ian Juma",
-            "email": "ijuma@africastalking.com",
-            "homepage": "https://www.africastalking.com"
-        },
-        {
-            "name": "Paul Bombo",
-            "email": "pbombo@africastalking.com",
-            "homepage": "https://www.africastalking.com"
-        },
-        {
-            "name": "Salama Balekage",
-            "email": "sbalekage@africastalking.com",
+            "name": "Africas's Talking",
+            "email": "support@africastalking.com",
             "homepage": "https://www.africastalking.com"
         }
     ],

composer.lock

@@ -3,7 +3,7 @@
     "description": "Simple SDK usage",
     "require": {
         "php": ">=5.3.0",
-        "africastalking/africastalking": "2.*",
+        "africastalking/africastalking": "2.0.0",
         "altorouter/altorouter": "1.1.0"
     }
 }