Version bump to 1.4.0

Prepare to publish the new changes since 1.3.3:
- Improved pen precision (and correct default color)
- `touching edge` and `if on edge, bounce` support
- `when timer greater than` support
- `loudness` and `when loudness greater than` support
- Fixed bug with "when this sprite/stage clicked"

package.json

@@ -1,6 +1,6 @@
 {
   "name": "leopard",
-  "version": "1.3.3",
+  "version": "1.4.0",
   "description": "Make Scratch-like projects with JavaScript.",
   "private": false,
   "browser": true,