switch to the built-in context package

.travis.yml

@@ -1,6 +1,6 @@
 language: go
 go:
-  - 1.3.3
+  - 1.7
   - 1.x
   - tip
 before_install:

context.go

@@ -1,9 +1,8 @@
 package backoff
 
 import (
+	"context"
 	"time"
-
-	"golang.org/x/net/context"
 )
 
 // BackOffContext is a backoff policy that stops retrying after the context

context_test.go

@@ -1,10 +1,9 @@
 package backoff
 
 import (
+	"context"
 	"testing"
 	"time"
-
-	"golang.org/x/net/context"
 )
 
 func TestContext(t *testing.T) {

example_test.go

@@ -1,9 +1,8 @@
 package backoff
 
 import (
+	"context"
 	"log"
-
-	"golang.org/x/net/context"
 )
 
 func ExampleRetry() {

retry_test.go

@@ -1,13 +1,12 @@
 package backoff
 
 import (
+	"context"
 	"errors"
 	"fmt"
 	"log"
 	"testing"
 	"time"
-
-	"golang.org/x/net/context"
 )
 
 func TestRetry(t *testing.T) {

ticker_test.go

@@ -1,13 +1,12 @@
 package backoff
 
 import (
+	"context"
 	"errors"
 	"fmt"
 	"log"
 	"testing"
 	"time"
-
-	"golang.org/x/net/context"
 )
 
 func TestTicker(t *testing.T) {