Update AndreasBriese/bbloom to latest version (#1305)

This commit fixes the `checkptr` issue reported in
#1294.
The `checkptr` issue was fixed in the upstream library
AndreasBriese/bbloom#9 . 

This PR updates the go.mod file to use the latest
version of `AndreasBriese/bbloom`

go.mod

@@ -3,7 +3,7 @@ module github.com/dgraph-io/badger
 go 1.12
 
 require (
-	github.com/AndreasBriese/bbloom v0.0.0-20190306092124-e2d15f34fcf9
+	github.com/AndreasBriese/bbloom v0.0.0-20190825152654-46b345b51c96
 	github.com/dgraph-io/ristretto v0.0.2
 	github.com/dustin/go-humanize v1.0.0
 	github.com/golang/protobuf v1.3.1

go.sum

@@ -1,5 +1,5 @@
-github.com/AndreasBriese/bbloom v0.0.0-20190306092124-e2d15f34fcf9 h1:HD8gA2tkByhMAwYaFAX9w2l7vxvBQ5NMoxDrkhqhtn4=
-github.com/AndreasBriese/bbloom v0.0.0-20190306092124-e2d15f34fcf9/go.mod h1:bOvUY6CB00SOBii9/FifXqc0awNKxLFCL/+pkDPuyl8=
+github.com/AndreasBriese/bbloom v0.0.0-20190825152654-46b345b51c96 h1:cTp8I5+VIoKjsnZuH8vjyaysT/ses3EvZeaV/1UkF2M=
+github.com/AndreasBriese/bbloom v0.0.0-20190825152654-46b345b51c96/go.mod h1:bOvUY6CB00SOBii9/FifXqc0awNKxLFCL/+pkDPuyl8=
 github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
 github.com/OneOfOne/xxhash v1.2.2 h1:KMrpdQIwFcEqXDklaen+P1axHaj9BSKzvpUUfnHldSE=
 github.com/OneOfOne/xxhash v1.2.2/go.mod h1:HSdplMjZKSmBqAxg5vPj2TmRDmfkzw+cTzAElWljhcU=