preparing for v2.1 release

Author: giowck

CHANGELOG

@@ -4,9 +4,13 @@ Version 2.1
 ===========
 
 [New Features]
+- Dropbox API migration to v2 (v1 will stop working by 2017-06-28)
 - Ability to hide the collection sidebar from the view menu
 - Polish traslation added (thanks to MCbx)
 
+[Improvements]
+- Updated Qt to 5.9 (User interface library) for better compatibility with Windows 10 and macOS Sierra
+
 [Bug Fixes]
 - Fixed crash when adding a new collection
 - Collection list is not updated correctly when a new collection is added or deleted

utils/definitionholder.cpp

@@ -16,13 +16,13 @@
 // Static variables initialization
 //-----------------------------------------------------------------------------
 
-QString DefinitionHolder::VERSION = "2.0";
+QString DefinitionHolder::VERSION = "2.1";
 QString DefinitionHolder::NAME = "Symphytum";
 QString DefinitionHolder::COMPANY = "giowisys";
 QString DefinitionHolder::DOMAIN_NAME = "giowisys.com";
 QString DefinitionHolder::UPDATE_URL = "https://giowck.github.io/symphytum/update/symphytum/updates";
 QString DefinitionHolder::DOWNLOAD_URL = "https://giowck.github.io/symphytum/update.html";
-int DefinitionHolder::SOFTWARE_BUILD = 5;
+int DefinitionHolder::SOFTWARE_BUILD = 6;
 int DefinitionHolder::DATABASE_VERSION = 2;
 bool DefinitionHolder::APP_STORE = false;
 QString DefinitionHolder::COPYRIGHT =