build: fix bazel version

[andy9775]

Executing tests on MacOS Catalina runs into issues with bazel 3.0.0.
Bazel will use the version specified in the .bazelversion file and hence
no matter what is installed, if 3.0.0 is available that will run.

d4d12a9 changed WORKSPACE and .bazelversion from 3.1.0 to 3.0.0 which
looks to have introduced this issue.

Changing back to 3.1.0 fixes tests on Catalina

[andy9775]

@devversion haven't had a chance to check on windows or linux.

[devversion]

do we know what specifically caused this issue in Bazel? I agree though that we should generally update. I'm surprised I rolled back accidentally (those changes shouldn't be part of the commit)

[andy9775]

@devversion it happens

I haven't had a chance to dig into it and a quick google search doesn't come up with anything. My best guess is that the bazel version wasn't working with the tool chain? c3fbcf6 updated everything to 3.1.0 but it was executing tests with 3.0.0.

I found the error via git bisect so I have no direct source

[jelbourn]

LGTM

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