Upgrades Badger version

migration: is described [here](https://dgraph.io/docs/badger/faq/#i-see-manifest-has-unsupported-version-x-we-support-y-error)

config.go

@@ -5,7 +5,7 @@ import (
 	"strings"
 	"time"
 
-	"github.com/dgraph-io/badger/v2"
+	"github.com/dgraph-io/badger/v3"
 	vault "github.com/hashicorp/vault/api"
 	"github.com/mitchellh/mapstructure"
 	"github.com/spf13/viper"

go.mod

@@ -4,23 +4,20 @@ go 1.14
 
 require (
 	github.com/DataDog/zstd v1.4.5 // indirect
-	github.com/dgraph-io/badger/v2 v2.2007.2
+	github.com/dgraph-io/badger/v3 v3.2011.1
 	github.com/dgryski/go-farm v0.0.0-20200201041132-a6ae2369ad13 // indirect
 	github.com/frankban/quicktest v1.4.0 // indirect
-	github.com/fsnotify/fsnotify v1.4.9 // indirect
 	github.com/gin-gonic/gin v1.6.3
 	github.com/go-git/go-git/v5 v5.1.0
 	github.com/hashicorp/go-hclog v0.12.0 // indirect
 	github.com/hashicorp/go-multierror v1.1.0 // indirect
 	github.com/hashicorp/go-retryablehttp v0.6.6 // indirect
 	github.com/hashicorp/go-rootcerts v1.0.2 // indirect
 	github.com/hashicorp/vault/api v1.0.5-0.20190730042357-746c0b111519
-	github.com/kr/pretty v0.2.0 // indirect
 	github.com/mitchellh/mapstructure v1.3.0
 	github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect
 	github.com/orcaman/concurrent-map v0.0.0-20190826125027-8c72a8bb44f6
 	github.com/pierrec/lz4 v2.5.2+incompatible // indirect
-	github.com/pkg/errors v0.9.1 // indirect
 	github.com/pyroscope-io/pyroscope v0.0.28
 	github.com/spf13/afero v1.2.2 // indirect
 	github.com/spf13/cast v1.3.1 // indirect