update badger db to its latest version and remove it from gopkg.toml/lock because it's vendored inside the sessionsdb/badger itself, this should fix https://github.com/kataras/iris/issues/848

Former-commit-id: 006b1d4d3c8dbe09b448ff33dade8978fddef4eb

Gopkg.lock

@@ -31,18 +31,6 @@
   packages = [".","ast","lexer","parser"]
   revision = "72acac2207479d21dd45898c2a4264246c818148"
 
-[[projects]]
-  name = "github.com/boltdb/bolt"
-  packages = ["."]
-  revision = "2f1ce7a837dcb8da3ec595b1dac9d0632f0f99e8"
-  version = "v1.3.1"
-
-[[projects]]
-  branch = "master"
-  name = "github.com/dgraph-io/badger"
-  packages = ["."]
-  revision = "d8b951787ebe5c42286475df8a3dea25045bda1a"
-
 [[projects]]
   name = "github.com/davecgh/go-spew"
   packages = ["spew"]
@@ -67,12 +55,6 @@
   packages = ["."]
   revision = "58f1f3387f7c57843ff829d92a759d08abe5a63f"
 
-[[projects]]
-  branch = "master"
-  name = "github.com/garyburd/redigo"
-  packages = ["internal","redis"]
-  revision = "b925df3cc15d8646e9b5b333ebaf3011385aba11"
-
 [[projects]]
   branch = "master"
   name = "github.com/gavv/monotime"
@@ -91,12 +73,6 @@
   packages = ["query"]
   revision = "53e6ce116135b80d037921a7fdd5138cf32d7a8a"
 
-[[projects]]
-  name = "github.com/gorilla/websocket"
-  packages = ["."]
-  revision = "ea4d1f681babbce9545c9c5f3d5194a789c89f5b"
-  version = "v1.2.0"
-
 [[projects]]
   name = "github.com/imkira/go-interpol"
   packages = ["."]
@@ -223,12 +199,6 @@
   revision = "69483b4bd14f5845b5a1e55bca19e954e827f1d0"
   version = "v1.1.4"
 
-[[projects]]
-  branch = "master"
-  name = "github.com/syndtr/goleveldb"
-  packages = ["leveldb","leveldb/cache","leveldb/comparer","leveldb/errors","leveldb/filter","leveldb/iterator","leveldb/journal","leveldb/memdb","leveldb/opt","leveldb/storage","leveldb/table","leveldb/util"]
-  revision = "b89cc31ef7977104127d34c1bd31ebd1a9db2199"
-
 [[projects]]
   branch = "master"
   name = "github.com/valyala/bytebufferpool"