bump deps

Author: leeoniya

package.json

@@ -39,7 +39,7 @@
   },
   "homepage": "https://github.com/leeoniya/uPlot#readme",
   "devDependencies": {
-    "rollup": "^2.15.0",
+    "rollup": "^2.16.1",
     "rollup-plugin-buble": "^0.19.8",
     "rollup-plugin-replace": "^2.2.0",
     "rollup-plugin-terser": "^6.1.0"