updated readme and added changelog

Author: dorin-ga

CHANGELOG.md

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+Changelog
+---------
+
+**4.0.0**
+
+* updated to C++17
+* refactored the code base
+* rewritten GA thread logic
+* rewritten build scripts
+* changed user id logic to always use randomized id (except if custom id is set)
+* replaced usage of unsafe cstrings and functions with safer alternatives
+* replaced RapidJson with ModernJson
+* removed Tizien support
+* added SDK init event
+* added health event
+* added external user id
+* safer handling of device properties retrieval
+* added exception handling
+* improved stability
+* various bug fixes
+
+**3.2.6**
+* changed event uuid field name
+
+**3.2.5**
+* added event uuid to events sent
+
+**3.2.4**
+* fixed progression tries bug
+* fixed max path length for configure writable path method
+
+**3.2.3**
+* added error events to be sent for invalid custom event fields used
+* added optional mergeFields argument to event methods to merge with global custom fields instead of overwrite them
+
+**3.2.2**
+* fixed missing custom event fields for when trying to fix missing session end events
+
+**3.2.1**
+* added option to use custom log handler
+
+**3.2.0**
+* added global custom event fields function to allow to add custom fields to events sent automatically by the SDK
+
+**3.1.3**
+* added functionality to force a new user in a/b testing without having to uninstall app first, simply use custom user id function to set a new user id which hasn't been used yet
+
+**3.1.2**
+* fix to custom event fields
+
+**3.1.1**
+* small fixes to shared libraries
+
+**3.1.0**
+* added custom event fields feature
+
+**3.0.8**
+* updated client ts validator
+
+**3.0.7**
+* removed memory info from automatic crash reporting
+
+**3.0.6**
+* added disable device info method
+
+**3.0.5**
+* added godot to version validator
+
+**3.0.4**
+* removed gender, birth year and facebook methods
+* updated curl and openssl libraries
+
+**3.0.3**
+* A/B testing fixes
+
+**3.0.2**
+* remote configs fixes
+
+**3.0.1**
+* various bug fixes
+
+**3.0.0**
+* command center is now called remote configs
+* A/B testing support added
+
+**2.1.9**
+* fixes to command center
+
+**2.1.8**
+* error reporting improved
+
+**2.1.7**
+* bug fix to too large log files
+
+**2.1.6**
+* added check if log files and database can't be created
+
+**2.1.5**
+* refactored code for singleton classes
+
+**2.1.4**
+* fixed hanging background thread after closing application
+* progression event bug fix
+
+**2.1.3**
+* removed std::string from the SDK
+
+**2.1.2**
+* thread fixes
+* dll freeze bug fix
+
+**2.1.1**
+* thread fixes
+
+**2.1.0**
+* added automatic error reporting
+* added enable/disable event submission
+
+**2.0.4**
+* fixed business event validation
+
+**2.0.3**
+* fixed shutdown issues
+
+**2.0.2**
+* fixed thread hanging on shutdown
+
+**2.0.1**
+* added command center functions to extern interface
+
+**2.0.0**
+* added command center functionality
+
+**1.4.6**
+* fixes for occasional crashes when shutting down
+* fixes crashes on UWP
+
+**1.4.5**
+* fixes for Linux interface
+
+**1.4.4**
+* bug fix to events thread stopping and not starting again
+
+**1.4.3**
+* added custom dimensions to design and error events
+* added GAState zero initialisation of fields
+* fixed linux build script
+
+**1.4.2**
+* fixed session length bug
+* fixed to not allow adding events when not in a session
+
+**1.4.1**
+* renamed onStop function to onSuspend
+* added a onQuit function
+
+**1.4.0**
+* updated to new logging library (windows, osx, linux)
+* added precompiled GameAnalytics libraries
+
+**1.3.8**
+* small correction to use int instead of double for session num
+
+**1.3.7**
+* https fix in curl library for mac
+
+**1.3.6**
+* bug fix for end session when using manual session handling
+
+**1.3.5**
+* session length precision improvement
+
+**1.3.4**
+* custom user id bug fix
+
+**1.3.3**
+* bug fix to dupplicate logs send to console (windows, mac, linux)
+
+**1.3.2**
+* added OS version, device model and device manufacturer to event (windows, mac)
+
+**1.3.1**
+* added support for Linux
+* logging initialisation updated for windows and mac (windows, mac)
+
+**1.3.0**
+* added support for Tizen
+
+**1.2.4**
+* removed unused files
+
+**1.2.3**
+* fixed build script for UWP
+* changed persistent path for UWP
+
+**1.2.2**
+* fixed issue with onstop method
+
+**1.2.1**
+* possible to set custom dimensions and demographics before initialise
+
+**1.2.0**
+* added UWP support
+
+**1.1.1**
+* fix to empty user id
+
+**1.1.0**
+* switched to use curl as network library
+
+**1.0.1**
+* fix for empty user id in events
+
+**1.0.0**
+* Initial version with Windows and Mac OS X support