Bump christophwurst/nextcloud from 19.0.0 to 20.0.4

Bumps [christophwurst/nextcloud](https://github.com/ChristophWurst/nextcloud_composer) from 19.0.0 to 20.0.4.
- [Release notes](https://github.com/ChristophWurst/nextcloud_composer/releases)
- [Commits](https://github.com/ChristophWurst/nextcloud_composer/compare/v19.0.0...v20.0.4)

Signed-off-by: dependabot[bot] <support@github.com>

composer.json

@@ -9,7 +9,7 @@
         "nextcloud/coding-standard": "^0.3.0"
     },
     "require-dev": {
-        "christophwurst/nextcloud": "v19.0.0",
+        "christophwurst/nextcloud": "v20.0.4",
         "christophwurst/nextcloud_testing": "0.10.0",
         "phan/phan": "^4.0"
     },

composer.lock

@@ -4,7 +4,7 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
         "This file is @generated automatically"
     ],
-    "content-hash": "d9cada5bc76cb5bbc3cac7e140961020",
+    "content-hash": "03f844c2babb111c971ca0a13fe02fef",
     "packages": [
         {
             "name": "composer/semver",
@@ -1663,16 +1663,16 @@
     "packages-dev": [
         {
             "name": "christophwurst/nextcloud",
-            "version": "v19.0.0",
+            "version": "v20.0.4",
             "source": {
                 "type": "git",
                 "url": "https://github.com/ChristophWurst/nextcloud_composer.git",
-                "reference": "1329e82c5aaf79ce546d9c86ebb057ebe6f857e4"
+                "reference": "a207b55848d1ac4c83a954eac90c07714bbdaaed"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/ChristophWurst/nextcloud_composer/zipball/1329e82c5aaf79ce546d9c86ebb057ebe6f857e4",
-                "reference": "1329e82c5aaf79ce546d9c86ebb057ebe6f857e4",
+                "url": "https://api.github.com/repos/ChristophWurst/nextcloud_composer/zipball/a207b55848d1ac4c83a954eac90c07714bbdaaed",
+                "reference": "a207b55848d1ac4c83a954eac90c07714bbdaaed",
                 "shasum": ""
             },
             "require": {
@@ -1681,7 +1681,7 @@
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "19.0.0-dev"
+                    "dev-master": "20.0.0-dev"
                 }
             },
             "notification-url": "https://packagist.org/downloads/",
@@ -1695,7 +1695,7 @@
                 }
             ],
             "description": "Composer package containing Nextcloud's public API (classes, interfaces)",
-            "time": "2020-08-24T12:38:49+00:00"
+            "time": "2020-12-23T12:42:07+00:00"
         },
         {
             "name": "christophwurst/nextcloud_testing",