update dependencies

- add watch
- remove fsnotify
- update others

vendor/github.com/radovskyb/watcher/samefile_windows.go

@@ -0,0 +1,12 @@
+// +build windows
+
+package watcher
+
+import "os"
+
+func SameFile(fi1, fi2 os.FileInfo) bool {
+	return fi1.ModTime() == fi2.ModTime() &&
+		fi1.Size() == fi2.Size() &&
+		fi1.Mode() == fi2.Mode() &&
+		fi1.IsDir() == fi2.IsDir()
+}