[Security] Bump tar from 4.4.1 to 4.4.8

[dependabot-preview]

Bumps tar from 4.4.1 to 4.4.8. This update includes security fixes.

Vulnerabilities fixed

Sourced from The GitHub Security Advisory Database.

High severity vulnerability that affects tar
A vulnerability was found in node-tar before version 4.4.2. An Arbitrary File Overwrite issue exists when extracting a tarball containing a hardlink to a file that already exists on the system, in conjunction with a later plain file with the same name as the hardlink. This plain file content replaces the existing file content.

Affected versions: < 4.4.2

Commits

• 074c89b 4.4.8
• c7bc240 Fix hardlink extraction with strip.
• 0068764 Fix example typo
• 88d6071 4.4.7
• 41fce66 Fix #190: polyfill Buffer in lib/parse.js for node v4 <4.5
• ec2581a clarify EOF error messages
• 6c95323 write-entry: handle shrinked file size than expected by lstat
• 34bdf6b travis: no windows. A known failing test is worse than no test.
• dcab9b8 travis: add windows
• 4eb4e9b travis: Add node 10, remove 4
• Additional commits viewable in compare view

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This change is 

[coveralls]

Coverage remained the same at 100.0% when pulling 02ff57a on dependabot/npm_and_yarn/tar-4.4.8 into cd8986e on master.

[dependabot-preview]

Superseded by #171.