RN: release v1.4 added

Author: misiektoja

RELEASE_NOTES.md

@@ -2,6 +2,21 @@
 
 This is a high-level summary of the most important changes. 
 
+# Changes in 1.4 (17 Jun 2024)
+
+**Features and Improvements**:
+
+- **NEW:** Added new parameter (**-z** / **--send_test_email_notification**) which allows to send test email notification to verify SMTP settings defined in the script
+- **IMPROVE:** Support for float type of timestamps added in date/time related functions
+- **IMPROVE:** Function get_short_date_from_ts() rewritten to display year if show_year == True and current year is different, also can omit displaying hour and minutes if show_hours == False
+- **IMPROVE:** Checking if correct version of Python (>=3.9) is installed
+- **IMPROVE:** Possibility to define email sending timeout (default set to 15 secs)
+
+**Bug fixes**:
+
+- **BUGFIX:** Fixed "SyntaxError: f-string: unmatched (" issue in older Python versions
+- **BUGFIX:** Fixed "SyntaxError: f-string expression part cannot include a backslash" issue in older Python versions
+
 # Changes in 1.3 (23 May 2024)
 
 **Features and Improvements**: