hterm 1.55: update changelog
hterm 1.55: update changelog

Update changelog to reflect recent commits.

Change-Id: Id68f5bb05bc60a81a26b1b05cbc2ec221148a02f
Reviewed-on: https://chromium-review.googlesource.com/272276
Reviewed-by: Rob Ginda <4419ac4e35d191308e944202d542b192188656d1@chromium.org>
Tested-by: Rob Ginda <4419ac4e35d191308e944202d542b192188656d1@chromium.org>

hernad/libapps,hernad/libapps,hernad/libapps,hernad/libapps