1.6.0

• babel task now saves source maps to separate files, also in production mode - #335
• new email-fix task to solve problems with inline emails styles on older Magento 2 versions - #247
• Babel upgraded to 7.x - #343
• Lots of dependencies upgrades
• npm-shrinkwrap.json added to make npm installs safer
• Required Node.js version set to >=8.9.0 <11.0.0 to target active LTS versions