PSR-4; min-stab: stable; drop required packages

composer.json

-{
-    "name": "axioma/filtration-bundle",
-    "description": "Filtration bundle, which handles filters and sorting functionality.",
-    "keywords": ["filtration, sorting, filter"],
-    "type": "library",
-    "license": "MIT",
-    "authors": [
-        {
-            "name": "Vladislav Krupenkin",
-            "email": "krupenkins@gmail.com"
-        },
-        {
-            "name": "Vadim Ashikhmah",
-            "email": "v.ashikhman@gmail.com"
-        },
-        {
-            "name": "Dmitry Abrosimov",
-            "email": "d.abrosimov@axioma.lv"
-        }
-    ],
-    "require": {
-        "php": ">=5.3.3",
-        "symfony/symfony": "^2.3 || ^3.0",
-        "doctrine/orm": "^2.2,>=2.2.3",
-        "doctrine/doctrine-bundle": "^1.2",
-        "twig/extensions": "^1.0",
-        "symfony/assetic-bundle": "^2.3 || ^3.0"
-    },
-    "suggest": {
-        "doctrine/mongodb-odm": "1.0.*@dev",
-        "doctrine/mongodb-odm-bundle": "3.0.*@dev"
-    },
-    "autoload": {
-        "psr-0": {
-            "Axioma\\FiltrationBundle": ""
-        }
-    },
-    "extra": {
-        "branch-alias": {
-            "dev-master": "1.0.x-dev"
-        }
-    },
-    "target-dir": "Axioma/FiltrationBundle",
-    "minimum-stability": "dev"
+{
+    "name": "axioma/filtration-bundle",
+    "description": "Filtration bundle, which handles filters and sorting functionality.",
+    "keywords": ["filtration, sorting, filter"],
+    "type": "library",
+    "license": "MIT",
+    "authors": [
+        {
+            "name": "Vladislav Krupenkin",
+            "email": "krupenkins@gmail.com"
+        },
+        {
+            "name": "Vadim Ashikhmah",
+            "email": "v.ashikhman@gmail.com"
+        },
+        {
+            "name": "Dmitry Abrosimov",
+            "email": "d.abrosimov@axioma.lv"
+        }
+    ],
+    "require": {
+        "php": "^7.3"
+    },
+    "autoload": {
+        "psr-4": {
+            "Axioma\\FiltrationBundle\\": ""
+        }
+    },
+    "minimum-stability": "stable"
 }
\ No newline at end of file