update dependencies

vendor/gopkg.in/AlecAivazis/survey.v1/terminal/error.go

@@ -0,0 +1,9 @@
+package terminal
+
+import (
+	"errors"
+)
+
+var (
+	InterruptErr = errors.New("interrupt")
+)

vendor/gopkg.in/AlecAivazis/survey.v1/terminal/runereader.go

@@ -1,7 +1,6 @@
 package terminal
 
 import (
-	"fmt"
 	"os"
 	"unicode"
 )
@@ -47,7 +46,7 @@ func (rr *RuneReader) ReadLine(mask rune) ([]rune, error) {
 			Print("\r\n")
 
 			// we're done processing the input, and treat interrupt like an error
-			return line, fmt.Errorf("interrupt")
+			return line, InterruptErr
 		}
 
 		// allow for backspace/delete editing of inputs