Update changelog.md

CHANGELOG.md

 # Change Log
 All notable changes to this project will be documented in this file.
 
+## v0.8.4 [05.10.2018]
+## Added
+- In menu bar, under "Edit" you will find "Clear Rooms and Doors button" to clear all defined rooms and doors.
+
+- Define points of a line using keyboard on status bar.
+
+## Changed
+- A new tidily icons are added.
+
+## Bugs fixed
+- Fixed a crash when deleting rooms.
+
+- Fixed a problem when width of lines change after highlighting.
+
+- Fixed a problem when room is deleted bug caption is still there.
+
+- Fixed a problem when captions are overlapped.
+
 ## v0.8.3 [16.05.2018]
 ### Added
 - Now user can type x and y to define endpoint for line and Hline.  !7