Merge pull request mailjet#6 from mailjet/headers-variables-json Handle X-MJ-Vars as json string
Merge pull request mailjet#3 from xawiers/user-headers-bug Incorrect method when user defined headers are set.
Merge pull request mailjet#2 from mailjet/handle_null_values exclude null values from payload
Merge pull request mailjet#1 from mailjet/support_v3_and_v3.1 Support v3 and v3.1
clean and fix
fix licence
doc mailjet
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