fix: requirements.txt to reduce vulnerabilities

The following vulnerabilities are fixed by pinning transitive dependencies:
- https://snyk.io/vuln/SNYK-PYTHON-JINJA2-1012994
- https://snyk.io/vuln/SNYK-PYTHON-JINJA2-174126
- https://snyk.io/vuln/SNYK-PYTHON-JINJA2-455616
- https://snyk.io/vuln/SNYK-PYTHON-WERKZEUG-1041750
- https://snyk.io/vuln/SNYK-PYTHON-WERKZEUG-40482
- https://snyk.io/vuln/SNYK-PYTHON-WERKZEUG-42069
- https://snyk.io/vuln/SNYK-PYTHON-WERKZEUG-458931
- https://snyk.io/vuln/SNYK-PYTHON-WERKZEUG-564338

requirements.txt

@@ -1,7 +1,7 @@
 Flask==0.10.1
-Jinja2==2.7.2
+Jinja2==2.11.3
 MarkupSafe==0.19
-Werkzeug==0.9.4
+Werkzeug==0.11.6
 beautifulsoup4==4.3.2
 dumptruck==0.1.5
 geopy==0.99