rename getMetadata() to readMetaData()

Matches what it's called elsewhere in the codebase

lib/read-metadata.js

@@ -12,9 +12,9 @@ const listPackage = {
   }
 }
 
-module.exports = getMetadata
+module.exports = readMetaData
 
-async function getMetadata(path, {
+async function readMetaData(path, {
   deploymentType = 'npm',
   deploymentName,
   quiet = false,