Update releasenotes and print missing module

Closes #1411

README.mkd

@@ -19,7 +19,8 @@ But we still managed to add a few, like extracting fully obfuscated RAR-sets.
 - The Windows installer is 64-bit only, for 32-bit use the standalone package.
 - Growl-support was removed.
 - macOS features such as the menu and notifications now use native code.
-- Built-in internet bandwith test.
+- Built-in internet bandwidth test.
+- TLS1.3 support for newsserver connections.
 
 ## Bugfixes since 2.3.9
 - Sample removal did not work if only 1 sample file was present.

SABnzbd.py

@@ -46,8 +46,9 @@ try:
 except ValueError:
     print("Sorry, requires Python module Cheetah 3 or higher.")
     sys.exit(1)
-except ImportError:
+except ImportError as e:
     print("Not all required Python modules are available, please check requirements.txt")
+    print("Missing module:", e.name)
     print("You can read more at: https://sabnzbd.org/python3")
     print("If you still experience problems, remove all .pyc files in this folder and subfolders")
     sys.exit(1)