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/google.golang.org/api/partners/v2/partners-api.json

@@ -1172,7 +1172,7 @@
       }
     }
   },
-  "revision": "20180202",
+  "revision": "20180403",
   "rootUrl": "https://partners.googleapis.com/",
   "schemas": {
     "AdWordsManagerAccountInfo": {
@@ -1940,7 +1940,7 @@
           "type": "integer"
         },
         "month": {
-          "description": "Month of year. Must be from 1 to 12.",
+          "description": "Month of year. Must be from 1 to 12, or 0 if specifying a date without a\nmonth.",
           "format": "int32",
           "type": "integer"
         },
@@ -3360,6 +3360,10 @@
       "description": "A resource representing a user of the Partners platform.",
       "id": "User",
       "properties": {
+        "afaInfoShared": {
+          "description": "Whether or not the user has opted to share their Academy for Ads info with\nGoogle Partners.",
+          "type": "boolean"
+        },
         "availableAdwordsManagerAccounts": {
           "description": "This is the list of AdWords Manager Accounts the user has edit access to.\nIf the user has edit access to multiple accounts, the user can choose the\npreferred account and we use this when a personal account is needed. Can\nbe empty meaning the user has access to no accounts.\n@OutputOnly",
           "items": {

vendor/google.golang.org/api/partners/v2/partners-gen.go

@@ -1030,7 +1030,9 @@ type Date struct {
 	// if specifying a year/month where the day is not significant.
 	Day int64 `json:"day,omitempty"`
 
-	// Month: Month of year. Must be from 1 to 12.
+	// Month: Month of year. Must be from 1 to 12, or 0 if specifying a date
+	// without a
+	// month.
 	Month int64 `json:"month,omitempty"`
 
 	// Year: Year of date. Must be from 1 to 9999, or 0 if specifying a date
@@ -2872,6 +2874,11 @@ func (s *TrafficSource) MarshalJSON() ([]byte, error) {
 
 // User: A resource representing a user of the Partners platform.
 type User struct {
+	// AfaInfoShared: Whether or not the user has opted to share their
+	// Academy for Ads info with
+	// Google Partners.
+	AfaInfoShared bool `json:"afaInfoShared,omitempty"`
+
 	// AvailableAdwordsManagerAccounts: This is the list of AdWords Manager
 	// Accounts the user has edit access to.
 	// If the user has edit access to multiple accounts, the user can choose
@@ -2932,22 +2939,20 @@ type User struct {
 	// server.
 	googleapi.ServerResponse `json:"-"`
 
-	// ForceSendFields is a list of field names (e.g.
-	// "AvailableAdwordsManagerAccounts") to unconditionally include in API
-	// requests. By default, fields with empty values are omitted from API
-	// requests. However, any non-pointer, non-interface field appearing in
-	// ForceSendFields will be sent to the server regardless of whether the
-	// field is empty or not. This may be used to include empty fields in
-	// Patch requests.
+	// ForceSendFields is a list of field names (e.g. "AfaInfoShared") to
+	// unconditionally include in API requests. By default, fields with
+	// empty values are omitted from API requests. However, any non-pointer,
+	// non-interface field appearing in ForceSendFields will be sent to the
+	// server regardless of whether the field is empty or not. This may be
+	// used to include empty fields in Patch requests.
 	ForceSendFields []string `json:"-"`
 
-	// NullFields is a list of field names (e.g.
-	// "AvailableAdwordsManagerAccounts") to include in API requests with
-	// the JSON null value. By default, fields with empty values are omitted
-	// from API requests. However, any field with an empty value appearing
-	// in NullFields will be sent to the server as null. It is an error if a
-	// field in this list has a non-empty value. This may be used to include
-	// null fields in Patch requests.
+	// NullFields is a list of field names (e.g. "AfaInfoShared") to include
+	// in API requests with the JSON null value. By default, fields with
+	// empty values are omitted from API requests. However, any field with
+	// an empty value appearing in NullFields will be sent to the server as
+	// null. It is an error if a field in this list has a non-empty value.
+	// This may be used to include null fields in Patch requests.
 	NullFields []string `json:"-"`
 }