[w3c/webpayments-method-identifiers] [SECURE-CONTEXTS] should be a normative rather than informative reference (#29)

The specification currently [says](https://w3c.github.io/webpayments-method-identifiers/#syntax):
> The URL must be a potentially trustworthy URL as defined in the [SECURE-CONTEXTS] specification.

but then includes [SECURE-CONTEXTS] in the *informative* references section.  The use of **must** in the above sentence (but see #28) makes me think that this should instead be a *normative* reference.

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