Merge pull request dotnet/core-setup#4515 from dotnet-maestro-bot/master-UpdateDepend...
authorWes Haggard <weshaggard@users.noreply.github.com>
Fri, 31 Aug 2018 15:54:27 +0000 (08:54 -0700)
committerGitHub <noreply@github.com>
Fri, 31 Aug 2018 15:54:27 +0000 (08:54 -0700)
Update BuildTools, CoreClr, CoreFx to preview1-03131-01, preview1-26831-07, preview1-26831-06, respectively (master)

Commit migrated from https://github.com/dotnet/core-setup/commit/eab4b2fd162e453988af973878ddfa7eb9496a6b


Trivial merge