Fix passing hhvm version as rake argument

Gemfile.lock

@@ -4,7 +4,7 @@ GEM
     ast (2.4.2)
     json (2.6.3)
     parallel (1.23.0)
-    parser (3.2.2.0)
+    parser (3.2.2.1)
       ast (~> 2.4.1)
     progressbar (1.13.0)
     rainbow (3.1.1)
@@ -21,7 +21,7 @@ GEM
       rubocop-ast (>= 1.28.0, < 2.0)
       ruby-progressbar (~> 1.7)
       unicode-display_width (>= 2.4.0, < 3.0)
-    rubocop-ast (1.28.0)
+    rubocop-ast (1.28.1)
       parser (>= 3.2.1.0)
     ruby-progressbar (1.13.0)
     sync (0.5.0)

Rakefile

@@ -58,7 +58,7 @@ task 'universal-ctags', [:version] do |_, arguments|
   commit 'development/universal-ctags', arguments[:version]
 end
 
-task :hhvm do
+task :hhvm, [:version] do |_, arguments|
   raise 'Version is not specified.' unless arguments.key? :version
 
   checksum = {}