docs(bpos): add release-notes-0.9.8.1.md

docs/release-notes/release-notes-0.9.8.1.md

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+Elastos.ELA version 0.9.8.1 is now available from:
+
+  <https://download.elastos.io/elastos-ela/elastos-ela-v0.9.8.1/>
+
+This is a new major version release.
+
+Please report bugs using the issue tracker at GitHub:
+
+  <https://github.com/elastos/Elastos.ELA/issues>
+
+How to Upgrade
+==============
+
+If you are running version release_v0.9.7 and before, you should shut it down
+and wait until it has completely closed, then just copy over `ela`(on Linux) 
+and obtain the sponsors file to place it in the working directory.
+
+However, as usual, config, keystore and chaindata files are compatible.
+
+Compatibility
+==============
+
+Elastos.ELA is supported and extensively tested on operating systems
+using the Linux kernel. It is not recommended to use Elastos.ELA on
+unsupported systems.
+
+Elastos.ELA should also work on most other Unix-like systems but is not
+as frequently tested on them.
+
+As previously-supported CPU platforms, this release's pre-compiled
+distribution provides binaries for the x86_64 platform.
+
+Notable changes
+===============
+
+An issue related to submitAuxBlock has been fixed.
+
+0.9.8.1 change log
+=================
+
+### Bug Fixes
+
+* prevent record sponsor tx from tx pool ([e1f7ec8](https://github.com/elastos/Elastos.ELA/commit/e1f7ec8b2a0d72a5ba2b36c658795cc737716215))