Fix metavar for '--name' (#443)

Author: nmattia

README.md

@@ -244,7 +244,7 @@ Examples:
   niv add neovim/neovim --name vim # override inferred name
   niv add https://gcc.gnu.org/git/gcc.git # add an arbitrary Git repo
 
-Usage: niv add PACKAGE [-n|--name ARG] [ATTRIBUTES]
+Usage: niv add PACKAGE [-n|--name NAME] [ATTRIBUTES]
 
   Add a package
 

src/Niv/Cli.hs

@@ -280,7 +280,7 @@ parseCmdAdd =
     $ description
   where
     parsePackageShortcut = PackageShortcut <$> Opts.argument Opts.str (Opts.metavar "PACKAGE")
-    parsePackageNameOverride = PackageName <$> Opts.strOption ( Opts.long "name" <> Opts.short 'n' )
+    parsePackageNameOverride = PackageName <$> Opts.strOption ( Opts.long "name" <> Opts.short 'n' <> Opts.metavar "NAME")
     description =
       mconcat
         [ Opts.fullDesc,