Bump sleekxmpp from 1.3.1 to 1.3.2

Sourced from sleekxmpp's releases.

v1.3.2

patch release to fix Issue #442 - CVE-2017-5589+ Multiple XMPP Clients User Impersonation Vulnerability

• 285495d Merge pull request #448 from fritzy/v1.3.2
• 8c66e51 apply fix for Issue #442
• 6e27f28 Merge pull request #407 from SnijderC/develop
• 44db794 Merge pull request #408 from trusty/develop
• ba1b088 Merge pull request #413 from mathieui/xep-0334
• fbc283b Merge pull request #414 from mathieui/xep-0352
• e5cdd1a Implement XEP-0352 (client state indication)
• 203b873 Implement XEP-0334 (message processing hints)
• d438906 Update stanza.py
• 5f64a44 Update stanza.py
• Additional commits viewable in compare view

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