Exit status 130 when fzf is terminated by the user

Related: #345

src/constants.go

@@ -49,7 +49,8 @@ const (
 )
 
 const (
-	exitOk      = 0
-	exitNoMatch = 1
-	exitError   = 2
+	exitOk        = 0
+	exitNoMatch   = 1
+	exitError     = 2
+	exitInterrupt = 130
 )

src/terminal.go

@@ -791,7 +791,7 @@ func (t *Terminal) Loop() {
 						exit(exitNoMatch)
 					case reqQuit:
 						C.Close()
-						exit(exitError)
+						exit(exitInterrupt)
 					}
 				}
 				t.placeCursor()