Remove dependency on node-plur (removed upstream)

debian/control

@@ -5,7 +5,6 @@ Maintainer: Debian Javascript Maintainers <pkg-javascript-devel@lists.alioth.deb
 Uploaders: Pirate Praveen <praveen@debian.org>
 Build-Depends:
  debhelper (>= 11~)
- , dh-buildinfo
  , nodejs
 Standards-Version: 4.1.4
 Homepage: https://github.com/sindresorhus/pretty-ms#readme
@@ -18,7 +17,6 @@ Depends:
  ${misc:Depends}
  , nodejs
  , node-parse-ms (>= 1.0.0)
- , node-plur (>= 2.1.2)
 Description: Convert milliseconds to a human readable string
  This module can convert 1337000000 → 15d 11h 23m 20s.
  .