Update dependency twilio to v6.29.4 (#144)

renovate[bot] · Clivern · commit 962a3736c132 · 2019-08-22T11:59:33.000+02:00
diff --git a/requirements.txt b/requirements.txt
@@ -9,7 +9,7 @@ celery==4.3.0
 redis==3.3.8
 cryptography==2.7
 markdown2==2.3.8
-twilio==6.29.3
+twilio==6.29.4
 pyumetric==0.0.4
 pyvalitron==1.1.3
 feedgen==0.7.0
