Upgraded urllib3 to version 1.24.2 due to security vulnerability

Vulnerable versions: < 1.24.2
Patched version: 1.24.2

Ref: https://nvd.nist.gov/vuln/detail/CVE-2019-11324

Author: netromdk

Diff for: requirements.txt

@@ -10,7 +10,7 @@ pycodestyle==2.3.1
 pyflakes==1.6.0
 requests==2.20.0
 six==1.11.0
-urllib3==1.24.1
+urllib3==1.24.2
 vermin==0.4.2
 vulture==0.26
 wcwidth==0.1.7