[Snyk] Fix for 12 vulnerabilities

[snyk-bot]

Snyk has created this PR to fix one or more vulnerable packages in the `pip` dependencies of this project.

Changes included in this PR

• Changes to the following files to upgrade the vulnerable dependencies to a fixed version:
  • requirements.txt

⚠️ Warning

oauth2client 4.1.1 requires rsa, which is not installed.

Vulnerabilities that will be fixed

By pinning:

Severity	Issue	Upgrade	Breaking Change	Exploit Maturity
	Improper Input Validation SNYK-PYTHON-FLASK-42185	flask: 0.12.2 -> 0.12.3	No	No Known Exploit
	Denial of Service (DoS) SNYK-PYTHON-FLASK-451637	flask: 0.12.2 -> 0.12.3	No	No Known Exploit
	CRLF Injection SNYK-PYTHON-HTTPLIB2-569758	httplib2: 0.10.3 -> 0.18.0	No	No Known Exploit
	CRLF Injection SNYK-PYTHON-HTTPLIB2-570767	httplib2: 0.10.3 -> 0.18.0	No	No Known Exploit
	Sandbox Escape SNYK-PYTHON-JINJA2-174126	Jinja2: 2.9.6 -> 2.10.1	No	No Known Exploit
	Cross-site Scripting (XSS) SNYK-PYTHON-LXML-72651	lxml: 3.6.0 -> 4.2.5	No	No Known Exploit
	Information Exposure SNYK-PYTHON-REQUESTS-72435	requests: 2.17.3 -> 2.20	No	No Known Exploit
	Access Restriction Bypass SNYK-PYTHON-RSA-570831	rsa: 3.4.2 -> 4.1	No	No Known Exploit
	CRLF injection SNYK-PYTHON-URLLIB3-174323	urllib3: 1.21.1 -> 1.24.3	No	Mature
	Improper Certificate Validation SNYK-PYTHON-URLLIB3-174464	urllib3: 1.21.1 -> 1.24.3	No	No Known Exploit
	Authentication Bypass SNYK-PYTHON-URLLIB3-72681	urllib3: 1.21.1 -> 1.24.3	No	No Known Exploit
	Insufficient Randomness SNYK-PYTHON-WERKZEUG-458931	Werkzeug: 0.12.2 -> 0.15.3 werkzeug: 0.12.2 -> 0.15.3	No	No Known Exploit

Some vulnerabilities couldn't be fully fixed and so Snyk will still find them when the project is tested again. This may be because the vulnerability existed within more than one direct dependency, but not all of the effected dependencies could be upgraded.

Check the changes in this PR to ensure they won't cause issues with your project.

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