Update PIP dependencies

requirements.txt

 django-htcpcp-tea==0.3.1
 django-mailer==2.0.1
-django-phonenumber-field==4.0.0
-django-tables2==2.1.0
-django-rest-polymorphic==0.1.8
+django-phonenumber-field==5.0.0
+django-tables2==2.3.1
+django-rest-polymorphic==0.1.9
 django-bootstrap-datepicker-plus==3.0.5
 django-colorfield==0.3.2