goreleaser updates Homebrew tap with beta version releases

[duffn]

Steps to Reproduce the Problem

1. Release a beta or RC version of Buffalo
2. The Homebrew tap gets updated with the beta or RC by goreleaser

Expected Behavior

Only stable version releases update the Homebrew tap. I'm not sure if there's a way to indicate this with goreleaser.

Actual Behavior

All releases update the Homebrew tap

Info

### Buffalo Version
development

### App Information
Pwd=/Users/nicholasduffy/.gvm/pkgsets/go1.10.4/global/src/github.com/gobuffalo/gobuffalo
Root=/Users/nicholasduffy/.gvm/pkgsets/go1.10.4/global/src/github.com/gobuffalo/gobuffalo
GoPath=/Users/nicholasduffy/.gvm/pkgsets/go1.10.4/global
Name=gobuffalo
Bin=bin/gobuffalo
PackagePkg=github.com/gobuffalo/gobuffalo
ActionsPkg=github.com/gobuffalo/gobuffalo/actions
ModelsPkg=github.com/gobuffalo/gobuffalo/models
GriftsPkg=github.com/gobuffalo/gobuffalo/grifts
VCS=git
WithPop=false
WithSQLite=false
WithDep=true
WithWebpack=true
WithYarn=true
WithDocker=true
WithGrifts=true
WithModules=false

### Go Version
go version go1.10.4 darwin/amd64

### Go Env
GOARCH="amd64"
GOBIN=""
GOCACHE="/Users/nicholasduffy/Library/Caches/go-build"
GOEXE=""
GOHOSTARCH="amd64"
GOHOSTOS="darwin"
GOOS="darwin"
GOPATH="/Users/nicholasduffy/.gvm/pkgsets/go1.10.4/global"
GORACE=""
GOROOT="/Users/nicholasduffy/.gvm/gos/go1.10.4"
GOTMPDIR=""
GOTOOLDIR="/Users/nicholasduffy/.gvm/gos/go1.10.4/pkg/tool/darwin_amd64"
GCCGO="gccgo"
CC="clang"
CXX="clang++"
CGO_ENABLED="1"
CGO_CFLAGS="-g -O2"
CGO_CPPFLAGS=""
CGO_CXXFLAGS="-g -O2"
CGO_FFLAGS="-g -O2"
CGO_LDFLAGS="-g -O2"
PKG_CONFIG="pkg-config"
GOGCCFLAGS="-fPIC -m64 -pthread -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -fdebug-prefix-map=/var/folders/4g/dp5nynm51n9dktt40ccngvf40000gn/T/go-build746833422=/tmp/go-build -gno-record-gcc-switches -fno-common"

### Node Version
v8.12.0

### NPM Version
6.4.1

### Yarn Version
Yarn Not Found

### PostgreSQL Version
pg_ctl (PostgreSQL) 10.3

### MySQL Version
mysql  Ver 14.14 Distrib 5.7.21, for osx10.13 (x86_64) using  EditLine wrapper

### SQLite Version
3.24.0 2018-06-04 14:10:15 95fbac39baaab1c3a84fdfc82ccb7f42398b2e92f18a2a57bce1d4a713cbaapl

### Dep Version
dep Not Found

### Dep Status
dep Not Found

### go.mod
module github.com/gobuffalo/gobuffalo

require (
	github.com/BurntSushi/toml v0.3.0 // indirect
	github.com/PuerkitoBio/goquery v1.4.1 // indirect
	github.com/RoaringBitmap/roaring v0.4.16 // indirect
	github.com/Smerity/govarint v0.0.0-20150407073650-7265e41f48f1 // indirect
	github.com/andybalholm/cascadia v1.0.0 // indirect
	github.com/blevesearch/bleve v0.7.0
	github.com/blevesearch/blevex v0.0.0-20180227211930-4b158bb555a3 // indirect
	github.com/blevesearch/go-porterstemmer v1.0.1 // indirect
	github.com/blevesearch/segment v0.0.0-20160915185041-762005e7a34f // indirect
	github.com/boltdb/bolt v1.3.1 // indirect
	github.com/codegangsta/negroni v0.3.0 // indirect
	github.com/couchbase/vellum v0.0.0-20180822133609-0ceea4a37442 // indirect
	github.com/cznic/b v0.0.0-20180115125044-35e9bbe41f07 // indirect
	github.com/cznic/mathutil v0.0.0-20180504122225-ca4c9f2c1369 // indirect
	github.com/cznic/strutil v0.0.0-20171016134553-529a34b1c186 // indirect
	github.com/edsrzf/mmap-go v0.0.0-20170320065105-0bce6a688712 // indirect
	github.com/facebookgo/ensure v0.0.0-20160127193407-b4ab57deab51 // indirect
	github.com/facebookgo/stack v0.0.0-20160209184415-751773369052 // indirect
	github.com/facebookgo/subset v0.0.0-20150612182917-8dac2c3c4870 // indirect
	github.com/glycerine/go-unsnap-stream v0.0.0-20180323001048-9f0cb55181dd // indirect
	github.com/glycerine/goconvey v0.0.0-20180728074245-46e3a41ad493 // indirect
	github.com/gobuffalo/buffalo v0.12.6
	github.com/gobuffalo/envy v1.6.4
	github.com/gobuffalo/fizz v1.0.10 // indirect
	github.com/gobuffalo/github_flavored_markdown v1.0.0
	github.com/gobuffalo/makr v1.1.4 // indirect
	github.com/gobuffalo/mw-forcessl v0.0.0-20180802152810-73921ae7a130
	github.com/gobuffalo/mw-i18n v0.0.0-20180802152014-e3060b7e13d6
	github.com/gobuffalo/mw-paramlogger v0.0.0-20180807082017-6b90b69a724a
	github.com/gobuffalo/packr v1.13.2
	github.com/gobuffalo/plush v3.7.16+incompatible
	github.com/gobuffalo/pop v4.6.8+incompatible // indirect
	github.com/gobuffalo/tags v2.0.9+incompatible
	github.com/gobuffalo/uuid v2.0.3+incompatible // indirect
	github.com/gobuffalo/validate v2.0.3+incompatible // indirect
	github.com/gobuffalo/x v0.0.0-20180816203319-dc54d929c4a2
	github.com/golang/protobuf v1.2.0 // indirect
	github.com/golang/snappy v0.0.0-20180518054509-2e65f85255db // indirect
	github.com/gopherjs/gopherjs v0.0.0-20180820052304-89baedc74dd7 // indirect
	github.com/grokify/html-strip-tags-go v0.0.0-20180530080503-3f8856873ce5
	github.com/jmhodges/levigo v0.0.0-20161115193449-c42d9e0ca023 // indirect
	github.com/jtolds/gls v4.2.1+incompatible // indirect
	github.com/lib/pq v0.0.0-20180822103908-55f6f2718ccb // indirect
	github.com/markbates/going v1.0.2
	github.com/markbates/inflect v1.0.0
	github.com/markbates/refresh v1.4.2 // indirect
	github.com/markbates/willie v1.0.7
	github.com/microcosm-cc/bluemonday v1.0.1 // indirect
	github.com/mmcdole/gofeed v1.0.0-beta2
	github.com/mmcdole/goxpp v0.0.0-20170720115402-77e4a51a73ed // indirect
	github.com/monoculum/formam v0.0.0-20180818005819-0a5cdaa81e2e // indirect
	github.com/mschoch/smat v0.0.0-20160514031455-90eadee771ae // indirect
	github.com/philhofer/fwd v1.0.0 // indirect
	github.com/pkg/errors v0.8.0
	github.com/smartystreets/assertions v0.0.0-20180820201707-7c9eb446e3cf // indirect
	github.com/smartystreets/goconvey v0.0.0-20180222194500-ef6db91d284a // indirect
	github.com/steveyen/gtreap v0.0.0-20150807155958-0abe01ef9be2 // indirect
	github.com/stretchr/testify v1.2.2
	github.com/stvp/slug v0.0.0-20150928221549-5ab8191bb1fe
	github.com/syndtr/goleveldb v0.0.0-20180815032940-ae2bd5eed72d // indirect
	github.com/tecbot/gorocksdb v0.0.0-20180730101644-8b1d981498e1 // indirect
	github.com/tinylib/msgp v1.0.2 // indirect
	github.com/unrolled/secure v0.0.0-20180618144512-8287f3899c8e
	github.com/willf/bitset v1.1.9 // indirect
	golang.org/x/crypto v0.0.0-20180820150726-614d502a4dac // indirect
	golang.org/x/net v0.0.0-20180821023952-922f4815f713 // indirect
	golang.org/x/sys v0.0.0-20180821140842-3b58ed4ad339 // indirect
)

[markbates]

Yeah, I know. I found this out the hard way earlier this week. :)

You don’t happen to have a good way of fixing it, do you? Some flag or config?

[duffn]

It doesn't look like that functionality is currently available, but there is an open issue: goreleaser/goreleaser#667