Bump httplib2 from 0.12.1 to 0.18.0 in /SpeakerRecognitionAWS

Bumps [httplib2](https://github.com/httplib2/httplib2) from 0.12.1 to 0.18.0.
- [Release notes](https://github.com/httplib2/httplib2/releases)
- [Changelog](https://github.com/httplib2/httplib2/blob/master/CHANGELOG)
- [Commits](httplib2/httplib2@v0.12.1...v0.18.0)

Signed-off-by: dependabot[bot] <support@github.com>

SpeakerRecognitionAWS/requirements.txt

@@ -4,7 +4,7 @@ Flask==0.12.2
 Flask-MySQL==1.4.0
 Flask-MySQLdb==0.2.0
 Flask-WTF==0.14.2
-httplib2==0.12.1
+httplib2==0.18.0
 Jinja2==2.10
 mysql-connector-python-rf==2.2.2
 mysqlclient==1.3.13