playground: Include math/bits package.

dmitshur · dmitshur · commit bd0977fcb38b · 2017-08-25T14:13:00.000-04:00
Updates gopherjs/gopherjs#686.
diff --git a/playground/update.sh b/playground/update.sh
@@ -103,6 +103,7 @@ gopherjs install -m \
          io/ioutil \
          math \
          math/big \
+         math/bits \
          math/cmplx \
          math/rand \
          mime \
