Merge pull request 'Only run extractFramesGecko when required' (#4) from f0x-validatem/core:parse-stacktrace-fix into master

Reviewed-on: validatem/core#4

src/parse-stacktrace.js

@@ -99,7 +99,8 @@ function extractFrames(stack) {
 	// TODO: Maybe make this code even more cautious, and match each stacktrace line individually, aborting as soon as any one line cannot be parsed?
 	return defaultValue(
 		extractFramesV8(stack),
-		extractFramesGecko(stack)
+		() => extractFramesGecko(stack),
+		{ evaluate: true }
 	);
 }