Resolves several security vulnerabilities: - CVE-2019-16255: A code injection vulnerability of Shell#[] and Shell#test - CVE-2019-16254: HTTP response splitting in WEBrick (Additional fix) - CVE-2019-15845: A NUL injection vulnerability of File.fnmatch and File.fnmatch? - CVE-2019-16201: Regular Expression Denial of Service vulnerability of WEBrick’s Digest access authentication [Details](https://is.gd/qWSrzR)
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