Update dependency express to v4 - abandoned

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This PR contains the following updates:

Package	Type	Update	Change
express (source)	dependencies	major	3.0.0 -> 4.16.0

By merging this PR, the issue #27 will be automatically resolved and closed:

Severity	CVSS Score	CVE
High	7.5	CVE-2014-10064
High	7.5	CVE-2017-16119
High	7.5	CVE-2017-16138
High	7.5	WS-2014-0005
High	7.3	CVE-2014-6394
High	7.3	CVE-2014-6394
Medium	6.1	CVE-2013-7370
Medium	6.1	CVE-2013-7371
Medium	6.1	WS-2013-0004
Medium	5.4	CVE-2018-3717
Medium	5.3	CVE-2014-7191
Medium	5.3	CVE-2015-8859
Medium	5.3	CVE-2015-8859
Medium	5.3	CVE-2017-1000048
Medium	5.3	WS-2013-0003
Low	3.7	CVE-2014-6393

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