[Commits] [wesnoth/wesnoth] ffd163: gitignore: Add install_manifest.txt

[GitHub]

  Branch: refs/heads/master
  Home:   https://github.com/wesnoth/wesnoth
  Commit: ffd1638628b4ee651158f03a910eafa634060c88
      https://github.com/wesnoth/wesnoth/commit/ffd1638628b4ee651158f03a910eafa634060c88
  Author: aquileia <sk.aquileia at gmail.com>
  Date:   2016-05-23 (Mon, 23 May 2016)

  Changed paths:
    M .gitignore

  Log Message:
  -----------
  gitignore: Add install_manifest.txt

As suggested by @spixi

Due to commit d577938 where the *.txt rule was removed, we have to ignore that file manually.

[skip ci]