travis: Reduce ccache size
authorManuel Nickschas <sputnick@quassel-irc.org>
Mon, 24 Sep 2018 19:26:35 +0000 (21:26 +0200)
committerManuel Nickschas <sputnick@quassel-irc.org>
Sun, 18 Nov 2018 10:06:43 +0000 (11:06 +0100)
Reduce the ccache size in order to not waste too much time packing/
extracting the cache. Since we're only building one project, 1G should
be plenty.


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