Downgrade semver for compatibility with Node 6

[nicolo-ribaudo]

Q	A
Fixed Issues?	Fixes #10990
Patch: Bug Fix?	Yes
Major: Breaking Change?
Minor: New Feature?
Tests Added + Pass?	Yes
Documentation PR Link
Any Dependency Changes?
License	MIT

[ljharb]

@nicolo-ribaudo semver v6 also works down to node 0.8; i think that's the lowest you really need to go (and compared to v5, has better handling of prereleases)

[zloirock]

Pinned semver@7.0 works fine with Node 6 and will be deduplicated with core-js-compat.

[nicolo-ribaudo]

I used v5 because we are already using it in other Babel packages.
We can surely upgrade to a higher version now (or wait for Babel 8 soon and use ^7.0.0`), but I wanted to release a quick patch with a lower risk of breaking other things.

[eilon-shai]

when this version will be published?

[nicolo-ribaudo]

It has already been published a few minutes after this PR has been merged. Only the updated packages have been released.

[eilon-shai]

our build is failing (node 6), and I think it relates to this fix, getting
npm ERR! typeerror Error: Missing required argument #1
it fail on babel installation, for example:
npm i @babel/code-frame@7.8.0
but when trying @babel/code-frame@7.8.1 it says that this version does not exists
(one of the original dependencies that is failing is jest-util@23.4.0, it for example use the @babel/code-frame@7.8.0)

[ljharb]

That's an npm bug on windows, i believe (possibly a new, registry-caused one)

[eilon-shai]

this is happening both on jenkins (linux) and reproduced locally (mac os)
node 6.1.0 npm 3.8.6
npm i @babel/highlight@7.8.0 and others fail

[nicolo-ribaudo]

They have been published: https://www.npmjs.com/package/@babel/highlight
The npm registry is buggy and regularly has this problem; please report it to them.

@babel/code-frame@7.8.1 has not been published because there wasn't any change to that package after 7.8.0.

[eilon-shai]

ok, thanks