Suppression only works for the very first directive (which might not be user-controllable)

An attempt was made to workaround bug #206 downstream by using the suppression feature: bvaughn/react-virtualized#1635
However, that workaround didn't seem to work - the problem still exists with the version deployed afterwards.

I didn't try debugging it, but after a quick code-review I theorize this is caused by additional directives being added before babel-plugin-flow-react-proptypes runs. It might be a different reason, but this stands out.

---

The code only checks the first directive:

babel-plugin-flow-react-proptypes/src/index.js

Lines 516 to 522 in 67027b9

	const directives = path.node.directives;
	if(directives && directives.length) {
	const directive = directives[0];
	if (directive.value && directive.value.value === SUPPRESS_STRING) {
	suppress = true;
	}
	}

I'm not sure why this isn't something like:

const directives = path.node.directives ?? []; 
directives.forEach((directive) => {
    if (directive.value && directive.value.value === SUPPRESS_STRING) { 
        suppress = true; 
    }
}) 

Obviously a fix for #206 would be more important, but I think the suppression should also be improved.