Please update split-sequence to the latest

[takagi]

The current split-sequence on Quicklisp is of version 1.1. The following is in quicklisp-projects/split-sequence/source.txt.

https https://github.com/sharplispers/split-sequence/archive/v1.1.tar.gz

Split-sequence's latest version is 1.2.
https://github.com/sharplispers/split-sequence/archive/v1.2.tar.gz

Split-sequence's commit log:
https://github.com/sharplispers/split-sequence/commits/master

Thanks.