Update README.md

Author: macaba

README.md

@@ -4,7 +4,7 @@ Cross-platform UI tool for estimating noise spectral density (NSD) from time-ser
 
 This is intended to be an easy-to-use tool which allows anyone to quickly produce NSD charts that are directly comparable to other people's charts if they are produced by the same version of this tool. Customisation and configurability is very limited therefore power users will prefer their own scripts.
 
-<img src="https://user-images.githubusercontent.com/1031306/185251061-43503c84-0ca6-4a92-99c3-7f717cc6d696.png" height="500">
+<img src="/docs/v1.4.png" height="500">
 
 ## Input file format