fix: author in Appstore

It seems npmjs no longer provides the author information
from the module's original package.json. Instead let's
use the publisher's username in npmjs instead, as that
seems to be there consistently.

src/modules.ts

@@ -42,15 +42,11 @@ interface NpmModuleData {
   package: NpmPackageData
 }
 
-interface PersonInPackage {
-  name: string
-  email: string
-}
-
 export interface Package {
   name: string
-  author?: PersonInPackage
-  contributors?: PersonInPackage[]
+  publisher?: {
+    username: string
+  }
   dependencies: { [key: string]: any }
   version: string
   description: string
@@ -307,16 +303,9 @@ export function checkForNewServerVersion(
 }
 
 export function getAuthor(thePackage: Package): string {
-  debug(thePackage.name + ' author: ' + thePackage.author)
-  return (
-    (thePackage.author && (thePackage.author.name || thePackage.author.email)) +
-    '' +
-    (thePackage.contributors || [])
-      .map((contributor: any) => contributor.name || contributor.email)
-      .join(',') +
-    '' +
-    (thePackage.name.startsWith('@signalk/') ? ' (Signal K team)' : '')
-  )
+  return `${thePackage.publisher?.username}${
+    thePackage.name.startsWith('@signalk/') ? ' (Signal K team)' : ''
+  }`
 }
 
 export function getKeywords(thePackage: NpmPackageData): string[] {