Update badger 06/18/2020 (#5680)

This change brings following new commits from badger
```
dd332b0 Avoid panic in filltables() (#1365)
c45d966 Fix assert in background compression and encryption. (#1366)
```

Author: Dgraph GitHub

go.mod

@@ -16,7 +16,7 @@ require (
 	github.com/blevesearch/segment v0.0.0-20160915185041-762005e7a34f // indirect
 	github.com/blevesearch/snowballstem v0.0.0-20180110192139-26b06a2c243d // indirect
 	github.com/codahale/hdrhistogram v0.0.0-20161010025455-3a0bb77429bd
-	github.com/dgraph-io/badger/v2 v2.0.1-rc1.0.20200609141616-14386ac9b764
+	github.com/dgraph-io/badger/v2 v2.0.1-rc1.0.20200617052219-dd332b04e6e7
 	github.com/dgraph-io/dgo/v2 v2.2.1-0.20200319183917-53c7d5bc32a7
 	github.com/dgraph-io/ristretto v0.0.2-0.20200115201040-8f368f2f2ab3
 	github.com/dgrijalva/jwt-go v3.2.0+incompatible

go.sum

@@ -76,8 +76,8 @@ github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/dgraph-io/badger v1.6.0 h1:DshxFxZWXUcO0xX476VJC07Xsr6ZCBVRHKZ93Oh7Evo=
 github.com/dgraph-io/badger v1.6.0/go.mod h1:zwt7syl517jmP8s94KqSxTlM6IMsdhYy6psNgSztDR4=
-github.com/dgraph-io/badger/v2 v2.0.1-rc1.0.20200609141616-14386ac9b764 h1:cWmYs+E7F/w4KWIkVrV3VLUJkqolRa7y5G2LLMPQVQs=
-github.com/dgraph-io/badger/v2 v2.0.1-rc1.0.20200609141616-14386ac9b764/go.mod h1:3KY8+bsP8wI0OEnQJAKpd4wIJW/Mm32yw2j/9FUVnIM=
+github.com/dgraph-io/badger/v2 v2.0.1-rc1.0.20200617052219-dd332b04e6e7 h1:DGnkUbdu48x8SgVR3bENgKQKGwxIKZJ7RYNVFrpqcn0=
+github.com/dgraph-io/badger/v2 v2.0.1-rc1.0.20200617052219-dd332b04e6e7/go.mod h1:3KY8+bsP8wI0OEnQJAKpd4wIJW/Mm32yw2j/9FUVnIM=
 github.com/dgraph-io/dgo/v2 v2.2.1-0.20200319183917-53c7d5bc32a7 h1:9oFXHEReyRIB291rbdGwRk1PYegGO2XBtZ8muXPKqPA=
 github.com/dgraph-io/dgo/v2 v2.2.1-0.20200319183917-53c7d5bc32a7/go.mod h1:LJCkLxm5fUMcU+yb8gHFjHt7ChgNuz3YnQQ6MQkmscI=
 github.com/dgraph-io/ristretto v0.0.2-0.20200115201040-8f368f2f2ab3 h1:MQLRM35Pp0yAyBYksjbj1nZI/w6eyRY/mWoM1sFf4kU=