changes for travis build

Author: Raaghu

.travis.yml

@@ -4,9 +4,6 @@ php:
   - '5.3'
   - '5.4'
   - '5.6'
-  - '7.0'
-  - '7.1'
-  - nightly
 
 before_script:
   - composer update

composer.json

@@ -20,7 +20,7 @@
 		"php-platform/config" : "~0.1"
 	},
 	"require-dev" : {
-		"phpunit/phpunit" : "~5.7",
+		"phpunit/phpunit" : "~4.8",
 		"php-platform/mock-config" : "~0.1"
 	},
 	"autoload" : {