Fix issue updating sensitive project environment variables (#155)

Closes #154

Author: dglsparsons

client/environment_variable_update.go

@@ -10,7 +10,6 @@ import (
 // UpdateEnvironmentVariableRequest defines the information that needs to be passed to Vercel in order to
 // update an environment variable.
 type UpdateEnvironmentVariableRequest struct {
-	Key       string   `json:"key"`
 	Value     string   `json:"value"`
 	Target    []string `json:"target"`
 	GitBranch *string  `json:"gitBranch,omitempty"`

vercel/resource_project_environment_variable_model.go

@@ -58,7 +58,6 @@ func (e *ProjectEnvironmentVariable) toUpdateEnvironmentVariableRequest() client
 	}
 
 	return client.UpdateEnvironmentVariableRequest{
-		Key:       e.Key.ValueString(),
 		Value:     e.Value.ValueString(),
 		Target:    target,
 		GitBranch: toStrPointer(e.GitBranch),

vercel/resource_project_environment_variable_test.go

@@ -96,7 +96,7 @@ func TestAcc_ProjectEnvironmentVariables(t *testing.T) {
 					resource.TestCheckResourceAttr("vercel_project_environment_variable.example_git_branch", "git_branch", "test"),
 
 					testAccProjectEnvironmentVariableExists("vercel_project_environment_variable.example_sensitive", testTeam()),
-					resource.TestCheckResourceAttr("vercel_project_environment_variable.example_sensitive", "key", "foo_sensitive_updated"),
+					resource.TestCheckResourceAttr("vercel_project_environment_variable.example_sensitive", "key", "foo_sensitive"),
 					resource.TestCheckResourceAttr("vercel_project_environment_variable.example_sensitive", "value", "bar-sensitive-updated"),
 					resource.TestCheckTypeSetElemAttr("vercel_project_environment_variable.example_sensitive", "target.*", "production"),
 					resource.TestCheckResourceAttr("vercel_project_environment_variable.example_sensitive", "sensitive", "true"),
@@ -214,7 +214,7 @@ resource "vercel_project_environment_variable" "example_git_branch" {
 resource "vercel_project_environment_variable" "example_sensitive" {
 	project_id = vercel_project.example.id
 	%[3]s
-	key        = "foo_sensitive_updated"
+	key        = "foo_sensitive"
 	value      = "bar-sensitive-updated"
 	target     = ["production"]
 	sensitive  = true