Log Message:
tex-changebar{,-doc}: update to 3.7d

3.7d
another small fix to get rid of irregular spacing when \nochangebar is used

3.7c
Erroneous spacing was reported when using the optional argument of \cbstart or
\begin{changebar}. This release fixes that.

3.7b
This fix-release ads a missing error message for not using xeTeX and
it addresses a situation where processing of lines in the .cb2 file results
in a runaway error.

3.7a
This release of changebar (v3.7a) adds support for luaLaTeX, next to the
already existing support for pdfLaTex en XeLaTeX