Pin couchbase dep due to prebuild issue
Pin couchbase dep due to prebuild issue

https://github.com/couchbase/couchnode/commit/37a3b5314d9235252bef75744fe82673136b8e24#diff-b9cfc7f2cdf78a7f4b91a753d10865a2

yieldbot/catbox-couchbase,cmfatih/catbox-couchbase