Added Infection as a dev dependency

Author: paquettg

.gitattributes

@@ -1,10 +1,11 @@
-/tests              export-ignore
-/.scrutinizar.yml   export-ignore
-/.travis.yml        export-ignore
-/.gitignore         export-ignore
-/CHANGELOG.md       export-ignore
-/CONTRIBUTING.md    export-ignore
-/LICENSE.md         export-ignore
-/README.md          export-ignore
-/phpunit.php        export-ignore
-/phpunit.xml        export-ignore
+/tests               export-ignore
+/.scrutinizar.yml    export-ignore
+/.travis.yml         export-ignore
+/.gitignore          export-ignore
+/CHANGELOG.md        export-ignore
+/CONTRIBUTING.md     export-ignore
+/LICENSE.md          export-ignore
+/README.md           export-ignore
+/phpunit.php         export-ignore
+/phpunit.xml         export-ignore
+/infection.json.dist export-ignore

.gitignore

@@ -1,5 +1,6 @@
 composer.phar
 composer.lock
+infection.log
 /vendor/
 .idea/
 *.swp

composer.json

@@ -21,7 +21,8 @@
     "require-dev": {
         "phpunit/phpunit": "^7.5.1",
         "mockery/mockery": "^1.2",
-        "php-coveralls/php-coveralls": "^2.1"
+        "php-coveralls/php-coveralls": "^2.1",
+        "infection/infection": "^0.13.4"
     },
     "autoload": {
         "psr-4": { 

infection.json.dist

@@ -0,0 +1,14 @@
+{
+    "timeout": 10,
+    "source": {
+        "directories": [
+            "src\/PHPHtmlParser"
+        ]
+    },
+    "logs": {
+        "text": "infection.log"
+    },
+    "mutators": {
+        "@default": true
+    }
+}