Bump ejs from 2.5.9 to 2.6.1

Created by: dependabot-preview[bot]

Bumps ejs from 2.5.9 to 2.6.1.

Changelog

Sourced from ejs's changelog.

v2.6.1: 2018-04-18

• Async rendering (Viko)

Commits

• ef26a6d Version 2.6.1
• ebad8d4 Minor version bump for async rendering release
• 423d21d Added doc for the async rendering option
• 40bb0ea Use generated function instead of eval to get async func ctor
• 9c9f44c Merge branch 'master' into async
• 40cdb21 Fix merge conflict (again? could've sworn)
• 94841a1 Fix merge conflict
• 37bfeb0 Move var declaration to the beginning of the function
• c4f68f6 Document the outputFunctionName feature
• c8b69a3 Linting
• Additional commits viewable in compare view

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