Bump plugin version and update main javascript file

[hannaw93]

Summary

This PR can be summarized in the following changelog entry:

• Bumps ACF plugin version from 3.0.1 to 3.1

Relevant technical choices:

*

Test instructions

This PR can be tested by following these steps:

*

Fixes #

[coveralls]

Pull Request Test Coverage Report for Build 4926432000

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 52.459%

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Totals
Change from base Build 4855999089:	0.0%
Covered Lines:	128
Relevant Lines:	244

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💛 - Coveralls