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/multi2.pb.go

@@ -0,0 +1,128 @@
+// Code generated by protoc-gen-go. DO NOT EDIT.
+// source: multi/multi2.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 Multi2_Color int32
+
+const (
+	Multi2_BLUE  Multi2_Color = 1
+	Multi2_GREEN Multi2_Color = 2
+	Multi2_RED   Multi2_Color = 3
+)
+
+var Multi2_Color_name = map[int32]string{
+	1: "BLUE",
+	2: "GREEN",
+	3: "RED",
+}
+var Multi2_Color_value = map[string]int32{
+	"BLUE":  1,
+	"GREEN": 2,
+	"RED":   3,
+}
+
+func (x Multi2_Color) Enum() *Multi2_Color {
+	p := new(Multi2_Color)
+	*p = x
+	return p
+}
+func (x Multi2_Color) String() string {
+	return proto.EnumName(Multi2_Color_name, int32(x))
+}
+func (x *Multi2_Color) UnmarshalJSON(data []byte) error {
+	value, err := proto.UnmarshalJSONEnum(Multi2_Color_value, data, "Multi2_Color")
+	if err != nil {
+		return err
+	}
+	*x = Multi2_Color(value)
+	return nil
+}
+func (Multi2_Color) EnumDescriptor() ([]byte, []int) {
+	return fileDescriptor_multi2_c47490ad66d93e67, []int{0, 0}
+}
+
+type Multi2 struct {
+	RequiredValue        *int32        `protobuf:"varint,1,req,name=required_value,json=requiredValue" json:"required_value,omitempty"`
+	Color                *Multi2_Color `protobuf:"varint,2,opt,name=color,enum=multitest.Multi2_Color" json:"color,omitempty"`
+	XXX_NoUnkeyedLiteral struct{}      `json:"-"`
+	XXX_unrecognized     []byte        `json:"-"`
+	XXX_sizecache        int32         `json:"-"`
+}
+
+func (m *Multi2) Reset()         { *m = Multi2{} }
+func (m *Multi2) String() string { return proto.CompactTextString(m) }
+func (*Multi2) ProtoMessage()    {}
+func (*Multi2) Descriptor() ([]byte, []int) {
+	return fileDescriptor_multi2_c47490ad66d93e67, []int{0}
+}
+func (m *Multi2) XXX_Unmarshal(b []byte) error {
+	return xxx_messageInfo_Multi2.Unmarshal(m, b)
+}
+func (m *Multi2) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
+	return xxx_messageInfo_Multi2.Marshal(b, m, deterministic)
+}
+func (dst *Multi2) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_Multi2.Merge(dst, src)
+}
+func (m *Multi2) XXX_Size() int {
+	return xxx_messageInfo_Multi2.Size(m)
+}
+func (m *Multi2) XXX_DiscardUnknown() {
+	xxx_messageInfo_Multi2.DiscardUnknown(m)
+}
+
+var xxx_messageInfo_Multi2 proto.InternalMessageInfo
+
+func (m *Multi2) GetRequiredValue() int32 {
+	if m != nil && m.RequiredValue != nil {
+		return *m.RequiredValue
+	}
+	return 0
+}
+
+func (m *Multi2) GetColor() Multi2_Color {
+	if m != nil && m.Color != nil {
+		return *m.Color
+	}
+	return Multi2_BLUE
+}
+
+func init() {
+	proto.RegisterType((*Multi2)(nil), "multitest.Multi2")
+	proto.RegisterEnum("multitest.Multi2_Color", Multi2_Color_name, Multi2_Color_value)
+}
+
+func init() { proto.RegisterFile("multi/multi2.proto", fileDescriptor_multi2_c47490ad66d93e67) }
+
+var fileDescriptor_multi2_c47490ad66d93e67 = []byte{
+	// 202 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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+	0xff, 0xff, 0x49, 0x3b, 0x52, 0x44, 0xec, 0x00, 0x00, 0x00,
+}