feat(libnpmpack): use silent boolean instead of log.level

BREAKING CHANGE: this drops support for the `log` property and the
banner is shown using the silent option

Author: lukekarrys

workspaces/libnpmpack/lib/index.js

@@ -16,7 +16,7 @@ async function pack (spec = 'file:.', opts = {}) {
 
   // Default to true if no log options passed, set to false if we're in silent
   // mode
-  const banner = !opts.log || (opts.log.level !== 'silent')
+  const banner = !opts.silent
 
   if (spec.type === 'directory') {
     // prepack