small bugfixes (#2655)

* improve report visibility
* fix timesheet duration, which breaks validation
* added contributing section in README
* do not allow to change project for existing activities - fixes #2576
* bump theme version to fix FOSUserBundle dependency
* use entity color instead of inherited one - fixes #2200

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": "d4fcb30ed5f1db78d4f32f09388ea0b3",
+    "content-hash": "c031208fe6bb0d88b062cdd70e1b76c6",
     "packages": [
         {
             "name": "beberlei/doctrineextensions",
@@ -2361,7 +2361,7 @@
         },
         {
             "name": "kevinpapst/adminlte-bundle",
-            "version": "dev-master",
+            "version": "3.5",
             "source": {
                 "type": "git",
                 "url": "https://github.com/kevinpapst/AdminLTEBundle.git",
@@ -2399,7 +2399,6 @@
             "suggest": {
                 "knplabs/knp-menu-bundle": "Allows easy menu integration"
             },
-            "default-branch": true,
             "type": "symfony-bundle",
             "autoload": {
                 "psr-4": {
@@ -2427,7 +2426,7 @@
             "description": "Admin theme bundle for Symfony 4+ based on AdminLTE 2.4 with FOSUserBundle support",
             "support": {
                 "issues": "https://github.com/kevinpapst/AdminLTEBundle/issues",
-                "source": "https://github.com/kevinpapst/AdminLTEBundle/tree/master"
+                "source": "https://github.com/kevinpapst/AdminLTEBundle/tree/3.5"
             },
             "funding": [
                 {
@@ -13685,9 +13684,7 @@
     ],
     "aliases": [],
     "minimum-stability": "stable",
-    "stability-flags": {
-        "kevinpapst/adminlte-bundle": 20
-    },
+    "stability-flags": [],
     "prefer-stable": false,
     "prefer-lowest": false,
     "platform": {