Updated mjml dependency to 4.6.3#60

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probablyabear wants to merge 3 commits intomjmlio:masterfrom

probablyabear:update-mjml-version

Commits on Jul 24, 2020

Updated mjml dependency to 4.6.3 - resolved URIError issue when using non-standard URIs within mjml files
stephenrust-heb
committed
Changed mjml dependency version requirements to be compatible with v4.6.3
stephenrust-heb
committed
Set mjml version to 4.6.3 explicitly
stephenrust-heb
committed