gnucash-docs master: Bump version to 3.900 for future release.

[John Ralls]

Updated	 via  https://github.com/Gnucash/gnucash-docs/commit/e9d24d25 (commit)
	from  https://github.com/Gnucash/gnucash-docs/commit/5d546c0a (commit)



commit e9d24d250c880bafd1a340c2d3fc922c49d36f18
Author: John Ralls <jralls at ceridwen.us>
Date:   Mon Apr 2 09:17:02 2018 -0700

    Bump version to 3.900 for future release.



Summary of changes:
 configure.ac | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)