medmunds 1372ef21eb SendGrid: merge 'filters' in esp_extra ...

Previously, setting esp_extra['x-smtpapi']['filters']
would override the entire filters setting, potentially
undoing other Anymail options that use SendGrid
filters (like track_opens).

Now, 'filters' is special-cased, and merged with
any other Anymail filter options.

(We don't do a fully deep merge, because otherwise
there would be no way to use esp_extra to *clear*
Anymail settings.)

2016-04-30 10:21:11 -07:00

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