fix(anchor-scroll): scroll inside nextTick

[farnabaz]

Types of changes

• Bug fix (a non-breaking change which fixes an issue)
• New feature (a non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Description

Use nextTick to ensure page completely mounted, before scrolling to hash.

To check the behavior, click on GitHub template link in installation page

resolves #96

Checklist:

• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added tests to cover my changes (if not applicable, please state why)

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