Move coveralls dependency to travis

Author: Nyholm

.travis.yml

@@ -20,7 +20,7 @@ matrix:
           # Test the latest stable release
         - php: 7.1
         - php: 7.2
-          env: COVERAGE=true TEST_COMMAND="phpunit --coverage-clover build/logs/clover.xml"
+          env: COVERAGE=true TEST_COMMAND="phpunit --coverage-clover build/logs/clover.xml" DEPENDENCIES="satooshi/php-coveralls:^2.1"
 
           # Test LTS versions
         - php: 7.2

composer.json

@@ -18,8 +18,7 @@
     "require-dev": {
         "phpunit/phpunit": "^7.2.7",
         "symfony/http-foundation": "^3.4 || ^4.0",
-        "zendframework/zend-diactoros": "^1.8",
-        "satooshi/php-coveralls": "^1.1"
+        "zendframework/zend-diactoros": "^1.8"
     },
     "autoload": {
         "psr-4": {