Fix formatVersion

[CaptainGlac1er]

Before the regex would parse
77.0.3865 -> 77.0.386
After the regex fix
77.0.3865 -> 77.0.3865

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[googlebot]

Thanks for your pull request. It looks like this may be your first contribution to a Google open source project (if not, look below for help). Before we can look at your pull request, you'll need to sign a Contributor License Agreement (CLA).

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[CaptainGlac1er]

@googlebot I signed it!

[googlebot]

CLAs look good, thanks!

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[googlebot]

CLAs look good, thanks!

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[googlebot]

All (the pull request submitter and all commit authors) CLAs are signed, but one or more commits were authored or co-authored by someone other than the pull request submitter.

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[googlebot]

All (the pull request submitter and all commit authors) CLAs are signed, but one or more commits were authored or co-authored by someone other than the pull request submitter.

We need to confirm that all authors are ok with their commits being contributed to this project. Please have them confirm that by leaving a comment that contains only @googlebot I consent. in this pull request.

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[googlebot]

CLAs look good, thanks!

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[googlebot]

CLAs look good, thanks!

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[martin770]

Looks good to me. Applying this change allows me to download a newer version of chromedriver (e.g. '71.0.3578' or '79.0.3945') by making the 4th segment of the version optional.

[CaptainGlac1er]

@cnishina any thoughts on the fix for the unescaped period in the regex?