prepare release 3.3.1

RELEASE-NOTES

@@ -1,3 +1,9 @@
+# Release 3.3.1 - (December 20, 2018)
+
+ * Qt: Fix invoices tab crash (#4941)
+ * Android: Minor GUI improvements
+
+
 # Release 3.3.0 - Hodler's Edition (December 19, 2018)
 
  * The network layer has been rewritten using asyncio and aiorpcx.

electrum/version.py

@@ -1,5 +1,5 @@
-ELECTRUM_VERSION = '3.3.0'   # version of the client package
+ELECTRUM_VERSION = '3.3.1'   # version of the client package
-APK_VERSION = '3.3.0.0'      # read by buildozer.spec
+APK_VERSION = '3.3.1.0'      # read by buildozer.spec
 
 PROTOCOL_VERSION = '1.4'     # protocol version requested