lock version on phpunit7

Author: ppshobi

.travis.yml

@@ -16,6 +16,6 @@ script:
   - "docker pull valeriansaliou/sonic:v1.2.2"
   - "docker run -d -p 1491:1491 -v $PWD/sonic.cfg:/etc/sonic.cfg -v /tmp/sonic:/var/lib/sonic/store/ valeriansaliou/sonic:v1.2.0"
   - "sudo $PWD/.travis/wait-for-it.sh 127.0.0.1:1491"
-  - "phpunit --coverage-clover=coverage.xml"
+  - "vendor/bin/phpunit --coverage-clover=coverage.xml"
 after_success:
   - bash <(curl -s https://codecov.io/bash)

composer.json

@@ -9,7 +9,7 @@
     "search engine"
   ],
   "require": {
-    "php": "^7.0"
+    "php": "~7.0"
   },
   "require-dev": {
     "phpunit/phpunit": "^7.0"