1.2

Here's a minor release.

It's just stuff that is already in master, nothing new.

And here's a changelog.

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### Bug Fixes

* Handle failures in the libcangjie_cli tool correctly, instead of crashing
  a segmentation fault. (Sam)
* Fixed a couple of typos in the libcangjie_cli tool which prevented it from
  working properly for some filter values. (Mathieu)
* Use /bin/sh for the autogen.sh script, to improve cross-platform
  compatibility. (Sam)
* Fixed a bunch of issues in our Cangjie code data.
  (Mathieu, Koala, Wan Leung, Antony)

### Docs Improvements

* Added installation instructions for Arch Linux (Antony) and NixOS. (Sam)
* Removed an obsolete (and confusing) notice about release tarballs. (Mathieu)
* Added missing hiragana filter to the libcangjie_cli help. (Mathieu)