ri: hush some warnings

Closes #343

Author: graywolf

completions/ri

@@ -23,7 +23,7 @@ _ri_get_methods()
         # older versions of ri didn't distinguish between class/module and
         # instance methods
         COMPREPLY+=( \
-            "$(ruby -W0 $ri_path "${classes[@]}" | ruby -ane \
+            "$(ruby -W0 $ri_path "${classes[@]}" 2>/dev/null | ruby -ane \
             'if /^-/.../^-/ and ! /^-/ and ! /^ +(class|module): / then \
             print $_.split(/, |,$| +/).grep(/^[^\[]*$/).join("\n"); \
             end' | sort -u)" )