This fixes the bad checksum for Sereal.

The Sereal repo was affected by the symlink checksum bug of go 1.11.3.
This recomputes the checksum using go 1.11.5.

bump dcrdata version to 3.1.2

Author: chappjc

go.sum

@@ -2,7 +2,7 @@ github.com/AndreasBriese/bbloom v0.0.0-20170702084017-28f7e881ca57 h1:CVuXDbdzPW
 github.com/AndreasBriese/bbloom v0.0.0-20170702084017-28f7e881ca57/go.mod h1:bOvUY6CB00SOBii9/FifXqc0awNKxLFCL/+pkDPuyl8=
 github.com/DataDog/zstd v1.3.4 h1:LAGHkXuvC6yky+C2CUG2tD7w8QlrUwpue8XwIh0X4AY=
 github.com/DataDog/zstd v1.3.4/go.mod h1:1jcaCB/ufaK+sKp1NBhlGmpz41jOoPQ35bpF36t7BBo=
-github.com/Sereal/Sereal v0.0.0-20180727013122-68c42fd7bfdf h1:gziqYtUl2f8Oo1/KovOJt3L+rw3TMC59rjiec32/azA=
+github.com/Sereal/Sereal v0.0.0-20180727013122-68c42fd7bfdf h1:WHiAGkqDYWg1SAc5yWsqlxd3IPLTk9jFWEH/38AL7mA=
 github.com/Sereal/Sereal v0.0.0-20180727013122-68c42fd7bfdf/go.mod h1:D0JMgToj/WdxCgd30Kc1UcA9E+WdZoJqeVOuYW7iTBM=
 github.com/aead/siphash v0.0.0-20170329201724-e404fcfc8885 h1:bBmEG9/q1xH07CqeeFw1ejup6Kw+/88WhhLHqIJ0ngQ=
 github.com/aead/siphash v0.0.0-20170329201724-e404fcfc8885/go.mod h1:Nywa3cDsYNNK3gaciGTWPwHt0wlpNV15vwmswBAUSII=

version/version.go

@@ -26,7 +26,7 @@ const (
 	AppName  string = "dcrdata"
 	AppMajor uint   = 3
 	AppMinor uint   = 1
-	AppPatch uint   = 1
+	AppPatch uint   = 2
 )
 
 // go build -ldflags "-X github.com/decred/dcrdata/v3/version.appPreRelease= -X github.com/decred/dcrdata/v3/version.appBuild=`git rev-parse --short HEAD`"