Update README.md

README.md

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 # go-test
 Interface testing tool for pure go language development (similar to postman)
 
+Continually updated...
 
 ****
     Don't forget, that you need the GTK-Development-Packages.If you use linux, you should install libgtk+-2.0 and packages that depend on gtk.
     On Debian and Debian derived distributions you can run (as root):
     apt-get install libgtk2.0-dev libglib2.0-dev libgtksourceview2.0-dev
     If you use windows, find gtk binary packages from here:
     http://www.gtk.org/download/windows.php*
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+Preliminary effect display：
+
+![image](https://github.com/spider1998/go-test/blob/master/test/test.png)