update readme to 0.3.0

Author: carsonip

README.md

@@ -83,11 +83,20 @@ In case you would like to deploy a version which does not require Qt libraries i
 
 ## History
 
-0.2.1: Fixed subtitle delay problem
+0.3.0:
+* Added customizable subtitle shadow (text outline)
+* Customizable subtitle font color
+* Remember window position and size
+* Minor bug fixes
 
-0.2.0: Added Charset Detection
+0.2.1:
+* Fixed subtitle delay problem
 
-0.1.0: First beta release
+0.2.0:
+* Added Charset Detection
+
+0.1.0:
+* First beta release
 
 ## Credits