Update TravisCI dependencies
diff --git a/.travis.yml b/.travis.yml
index 6e1dbd0..710ca57 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -9,6 +9,7 @@
   - go get code.google.com/p/go.tools/cmd/cover
   - go get github.com/axw/gocov/gocov
   - go get github.com/mattn/goveralls
+  - go get github.com/mitchellh/mapstructure
   - export PATH=$PATH:$HOME/gopath/bin/
   - goveralls 2k7PTU3xa474Hymwgdj6XjqenNfGTNkO8