vendor: update all dependencies

* Update all dependencies
  * Remove all `[[constraint]]` from Gopkg.toml
  * Add in the minimum number of `[[override]]` to build
  * Remove go get of github.com/inconshreveable/mousetrap as it is vendored
  * Update docs with new policy on constraints

vendor/github.com/golang/protobuf/protoc-gen-go/testdata/multi/multi3.pb.go

@@ -0,0 +1,115 @@
+// Code generated by protoc-gen-go. DO NOT EDIT.
+// source: multi/multi3.proto
+
+package multitest // import "github.com/golang/protobuf/protoc-gen-go/testdata/multi"
+
+import proto "github.com/golang/protobuf/proto"
+import fmt "fmt"
+import math "math"
+
+// Reference imports to suppress errors if they are not otherwise used.
+var _ = proto.Marshal
+var _ = fmt.Errorf
+var _ = math.Inf
+
+// This is a compile-time assertion to ensure that this generated file
+// is compatible with the proto package it is being compiled against.
+// A compilation error at this line likely means your copy of the
+// proto package needs to be updated.
+const _ = proto.ProtoPackageIsVersion2 // please upgrade the proto package
+
+type Multi3_HatType int32
+
+const (
+	Multi3_FEDORA Multi3_HatType = 1
+	Multi3_FEZ    Multi3_HatType = 2
+)
+
+var Multi3_HatType_name = map[int32]string{
+	1: "FEDORA",
+	2: "FEZ",
+}
+var Multi3_HatType_value = map[string]int32{
+	"FEDORA": 1,
+	"FEZ":    2,
+}
+
+func (x Multi3_HatType) Enum() *Multi3_HatType {
+	p := new(Multi3_HatType)
+	*p = x
+	return p
+}
+func (x Multi3_HatType) String() string {
+	return proto.EnumName(Multi3_HatType_name, int32(x))
+}
+func (x *Multi3_HatType) UnmarshalJSON(data []byte) error {
+	value, err := proto.UnmarshalJSONEnum(Multi3_HatType_value, data, "Multi3_HatType")
+	if err != nil {
+		return err
+	}
+	*x = Multi3_HatType(value)
+	return nil
+}
+func (Multi3_HatType) EnumDescriptor() ([]byte, []int) {
+	return fileDescriptor_multi3_d55a72b4628b7875, []int{0, 0}
+}
+
+type Multi3 struct {
+	HatType              *Multi3_HatType `protobuf:"varint,1,opt,name=hat_type,json=hatType,enum=multitest.Multi3_HatType" json:"hat_type,omitempty"`
+	XXX_NoUnkeyedLiteral struct{}        `json:"-"`
+	XXX_unrecognized     []byte          `json:"-"`
+	XXX_sizecache        int32           `json:"-"`
+}
+
+func (m *Multi3) Reset()         { *m = Multi3{} }
+func (m *Multi3) String() string { return proto.CompactTextString(m) }
+func (*Multi3) ProtoMessage()    {}
+func (*Multi3) Descriptor() ([]byte, []int) {
+	return fileDescriptor_multi3_d55a72b4628b7875, []int{0}
+}
+func (m *Multi3) XXX_Unmarshal(b []byte) error {
+	return xxx_messageInfo_Multi3.Unmarshal(m, b)
+}
+func (m *Multi3) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
+	return xxx_messageInfo_Multi3.Marshal(b, m, deterministic)
+}
+func (dst *Multi3) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_Multi3.Merge(dst, src)
+}
+func (m *Multi3) XXX_Size() int {
+	return xxx_messageInfo_Multi3.Size(m)
+}
+func (m *Multi3) XXX_DiscardUnknown() {
+	xxx_messageInfo_Multi3.DiscardUnknown(m)
+}
+
+var xxx_messageInfo_Multi3 proto.InternalMessageInfo
+
+func (m *Multi3) GetHatType() Multi3_HatType {
+	if m != nil && m.HatType != nil {
+		return *m.HatType
+	}
+	return Multi3_FEDORA
+}
+
+func init() {
+	proto.RegisterType((*Multi3)(nil), "multitest.Multi3")
+	proto.RegisterEnum("multitest.Multi3_HatType", Multi3_HatType_name, Multi3_HatType_value)
+}
+
+func init() { proto.RegisterFile("multi/multi3.proto", fileDescriptor_multi3_d55a72b4628b7875) }
+
+var fileDescriptor_multi3_d55a72b4628b7875 = []byte{
+	// 170 bytes of a gzipped FileDescriptorProto
+	0x1f, 0x8b, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0xff, 0xe2, 0x12, 0xca, 0x2d, 0xcd, 0x29,
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+	0x6a, 0x71, 0x89, 0x52, 0x1c, 0x17, 0x9b, 0x2f, 0x58, 0x4a, 0xc8, 0x84, 0x8b, 0x23, 0x23, 0xb1,
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+	0x0a, 0x30, 0x0a, 0xb1, 0x73, 0x31, 0xbb, 0xb9, 0x46, 0x09, 0x30, 0x39, 0x39, 0x47, 0x39, 0xa6,
+	0x67, 0x96, 0x64, 0x94, 0x26, 0xe9, 0x25, 0xe7, 0xe7, 0xea, 0xa7, 0xe7, 0xe7, 0x24, 0xe6, 0xa5,
+	0xeb, 0x83, 0x5d, 0x91, 0x54, 0x9a, 0x06, 0x61, 0x24, 0xeb, 0xa6, 0xa7, 0xe6, 0xe9, 0xa6, 0xe7,
+	0xeb, 0x83, 0x2c, 0x4a, 0x49, 0x2c, 0x49, 0x84, 0x38, 0xd6, 0x1a, 0x6e, 0x39, 0x20, 0x00, 0x00,
+	0xff, 0xff, 0xd5, 0xa4, 0x1a, 0x0e, 0xc4, 0x00, 0x00, 0x00,
+}