v0.3.31

Fixes

• Printing issues by bumping recast and babylon versions ( #200 , #201 @xixixao)
• Bug with template.expression when a literal with no interpolation was used ( #196, @jsnajdr)

Internally

• Drop usage of es6-promise ( #189, @wtgtybhertgeghgtwtg)

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Thank you @xixixao, @jsnajdr and @wtgtybhertgeghgtwtg for contributing!