add Shell::Command to deps to make zef happier #442

Author: stmuk

META.info

@@ -2,7 +2,7 @@
     "name"        : "p6doc",
     "version"     : "*",
     "description" : "Perl 6 documentation (tools and docs)",
-    "depends"     : [ "URI", "File::Temp", "Panda" ],
+    "depends"     : [ "URI", "File::Temp", "Panda", "Shell::Command" ],
     "provides"    : {
         "Perl6::Type"                   : "lib/Perl6/Type.pm",
         "Perl6::TypeGraph"              : "lib/Perl6/TypeGraph.pm",