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/multi1.pb.go

@@ -0,0 +1,96 @@
+// Code generated by protoc-gen-go. DO NOT EDIT.
+// source: multi/multi1.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 Multi1 struct {
+	Multi2               *Multi2         `protobuf:"bytes,1,req,name=multi2" json:"multi2,omitempty"`
+	Color                *Multi2_Color   `protobuf:"varint,2,opt,name=color,enum=multitest.Multi2_Color" json:"color,omitempty"`
+	HatType              *Multi3_HatType `protobuf:"varint,3,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 *Multi1) Reset()         { *m = Multi1{} }
+func (m *Multi1) String() string { return proto.CompactTextString(m) }
+func (*Multi1) ProtoMessage()    {}
+func (*Multi1) Descriptor() ([]byte, []int) {
+	return fileDescriptor_multi1_08e50c6822e808b8, []int{0}
+}
+func (m *Multi1) XXX_Unmarshal(b []byte) error {
+	return xxx_messageInfo_Multi1.Unmarshal(m, b)
+}
+func (m *Multi1) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
+	return xxx_messageInfo_Multi1.Marshal(b, m, deterministic)
+}
+func (dst *Multi1) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_Multi1.Merge(dst, src)
+}
+func (m *Multi1) XXX_Size() int {
+	return xxx_messageInfo_Multi1.Size(m)
+}
+func (m *Multi1) XXX_DiscardUnknown() {
+	xxx_messageInfo_Multi1.DiscardUnknown(m)
+}
+
+var xxx_messageInfo_Multi1 proto.InternalMessageInfo
+
+func (m *Multi1) GetMulti2() *Multi2 {
+	if m != nil {
+		return m.Multi2
+	}
+	return nil
+}
+
+func (m *Multi1) GetColor() Multi2_Color {
+	if m != nil && m.Color != nil {
+		return *m.Color
+	}
+	return Multi2_BLUE
+}
+
+func (m *Multi1) GetHatType() Multi3_HatType {
+	if m != nil && m.HatType != nil {
+		return *m.HatType
+	}
+	return Multi3_FEDORA
+}
+
+func init() {
+	proto.RegisterType((*Multi1)(nil), "multitest.Multi1")
+}
+
+func init() { proto.RegisterFile("multi/multi1.proto", fileDescriptor_multi1_08e50c6822e808b8) }
+
+var fileDescriptor_multi1_08e50c6822e808b8 = []byte{
+	// 200 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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+	0x2e, 0xd6, 0xe4, 0xfc, 0x9c, 0xfc, 0x22, 0x09, 0x26, 0x05, 0x46, 0x0d, 0x3e, 0x23, 0x71, 0x0c,
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+	0xd5, 0x49, 0xa5, 0x69, 0x10, 0x46, 0xb2, 0x6e, 0x7a, 0x6a, 0x9e, 0x6e, 0x7a, 0xbe, 0x3e, 0xc8,
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+	0x60, 0x7d, 0xfc, 0x9f, 0x27, 0x01, 0x00, 0x00,
+}