update changelog (inversify#1318)

Dc/release 5.1.0 (inversify#1315)

* update dependencies

* 5.1.0

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Update package.json

Merge pull request inversify#1233 from inversify/dcavanagh-patch-3

Update package.json, .npmignore

Merge pull request inversify#1232 from inversify/dcavanagh-patch-2-1

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Merge pull request inversify#980 from inversify/dcavanagh-patch-1

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Update PULL_REQUEST_TEMPLATE.md

added auditignore as workaround to upgrading to gulp4.0

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