Fix constraint collision in build

Author: Jean85

.travis.yml

@@ -23,7 +23,7 @@ matrix:
         - php: 7.0
         - php: 7.1
         - php: 7.2
-          env: COVERAGE=true TEST_COMMAND="composer test-ci"  DEPENDENCIES="henrikbjorn/phpspec-code-coverage:^1.0"
+          env: COVERAGE=true TEST_COMMAND="composer test-ci"  DEPENDENCIES="henrikbjorn/phpspec-code-coverage:^3.0"
 
           # Test LTS versions
         - php: 7.1