updated external dependencies to use 0.20.0

Author: Hussam

Diff for: composer.json

@@ -13,8 +13,8 @@
     "spryker/abstract-sniffs": "^1.0.0",
     "spryker/console": "^0.20.0",
     "spryker/kernel": "^0.20.0",
-    "spryker/symfony": "^1.0.0",
-    "spryker/zend": "^1.0.0",
+    "spryker/symfony": "^0.20.0",
+    "spryker/zend": "^0.20.0",
     "spryker/application": "^0.20.0",
     "spryker/graph": "^0.20.0"
   },

Diff for: src/Spryker/Zed/Development/Business/Composer/Updater/RequireExternalUpdater.php

@@ -66,7 +66,7 @@ public function update(array $composerJson)
             $filter = new CamelCaseToDash();
             $dependentBundle = strtolower($filter->filter($dependentBundle));
 
-            $composerJson[self::KEY_REQUIRE][$dependentBundle] = self::RELEASE_OPERATOR . '1.0.0';
+            $composerJson[self::KEY_REQUIRE][$dependentBundle] = self::RELEASE_OPERATOR . '0.20.0';
         }
 
         return $composerJson;