update recommended plotty version

santilland/plotty#27

README.md

@@ -12,7 +12,7 @@ Dependencies must be loaded:
 
 - [Leaflet >= 0.7.7](http://leafletjs.com)
 - [geotiff.js == 1.0.0-beta.13](https://github.com/constantinius/geotiff.js)
-- [plotty == 0.4.1](https://github.com/santilland/plotty) (optional)
+- [plotty >= 0.4.4](https://github.com/santilland/plotty) (optional)
 
 ```javascript
 import "leaflet-geotiff-2";

demo/index.html

@@ -76,7 +76,7 @@ <h2>Leaflet GeoTIFF (plotty example)</h2>
 
     <!--deps-->
     <script src="https://unpkg.com/[email protected]/dist/geotiff.bundle.js"></script>
-    <script src="https://unpkg.com/[email protected].1/dist/plotty.js"></script>
+    <script src="https://unpkg.com/[email protected].4/dist/plotty.min.js"></script>
 
     <!--the plugin-->
     <script src="../dist/leaflet-geotiff.js"></script>

package.json

@@ -29,6 +29,6 @@
     "rollup-plugin-babel": "^4.3.3"
   },
   "optionalDependencies": {
-    "plotty": "^0.4.1"
+    "plotty": "^0.4.4"
   }
 }