Addresses the following security issues:
- CVE-2020-16255: Unsafe Object Creation Vulnerability in JSON
(Additional fix)
- CVE-2020-10933: Heap exposure vulnerability in the socket library
[Details](https://chl.li/ljREu).
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)
Fixed major issue with `Net::Protocol::BufferedIO#write` raising
`NoMethodError` when sending large multi-byte strings.
[Details](https://is.gd/cQ8wcl).
