[w3c/webpayments-payment-handler] Fix wrt group charter (#147)

Use language consistent with this group's charter
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/webpayments-payment-handler/pull/147

-- Commit Summary --

  * Update 

-- File Changes --

    M CONTRIBUTING.md (31)

-- Patch Links --

https://github.com/w3c/webpayments-payment-handler/pull/147.patch
https://github.com/w3c/webpayments-payment-handler/pull/147.diff

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